Process for depolymerizing polyamides by hydrolysis

Abstract

A process for depolymerizing polyamide 6 contained in solid material M by hydrolysis, the process comprising the steps of supplying solid material M and a melting unit U M melting solid material M therein at a pressure p SM and at a temperature T SM to obtain a liquid stream S M supplying a liquid aqueous stream S SW at a pressure p SW and at a temperature T W feeding to a preliminary reaction unit U PR wherein stream S M is mixed with stream S W to obtain a liquid reaction feed stream S SF at a pressure p SF and at a temperature T F feeding stream S F to a chemical reaction unit U R feeding to a reaction unit U R wherein stream S F is subjected to polyamide 6 depolymerization conditions including a polyamide 6 depolymerization pressure p D and a polyamide 6 depolymerization temperature T D to obtain an aqueous depolymerization mixture containing ε-caprolactam dissolved in water in U R removing from U R an aqueous liquid reactor outlet stream S R where stream S R contains ε-caprolactam dissolved in water, the process comprising, 0.8 ≦ T SF / T D ≦ 1.05 and 0.9 ≦ p SF / p D ≦ 1.05.

Description

Technical Field

[0001] The present invention relates to a process for the hydrolytic (i.e., by hydrolysis) depolymerization of polyamides prepared from ε-caprolactam, and to an apparatus for carrying out a process for the hydrolytic depolymerization of polyamides prepared from ε-caprolactam, preferably an apparatus for carrying out the aforementioned process.

Background Art

[0002] Polyamides, specifically polyamide 6 characterized by the formula (-NH-(CH2)5-CO-), n can be found in many materials, such as packaging, automotive engineering plastics, and fiber filaments. The latter accounts for approximately 40% of polyamide 6 in the world market. Currently, only a very small portion of fiber filaments is recycled, but it accounts for a significant proportion of the world's CO2 emissions. Therefore, it is necessary to recycle polyamide 6 from such materials.

Summary of the Invention

Problems to be Solved by the Invention

[0003] There are processes for the alkaline depolymerization of polyamides. Therefore, there is a need to improve the process for depolymerizing polyamides, which can solve these problems.

Means for Solving the Problems

[0004] <According to the present invention, it has been found that an efficient depolymerization reaction for hydrolyzing polyamide 6 can be achieved by realizing a specific arrangement of a melting unit and a pre-reaction (preliminary reaction) unit upstream of a chemical reaction unit where the depolymerization reaction actually occurs. Furthermore, it has been found that when a specific design of the chemical reaction unit is realized, the process can be made more efficient. Based on this, an advantageous overall process for recycling (recycling) materials containing polyamide 6 can be provided by the present invention in combination with the order and combination of specific stages upstream and especially downstream of the chemical reaction unit that enables the reuse (recycling) of water and the very effective use of heat within the process.

[0005] Therefore, the present invention is a process for depolymerizing polyamide 6 contained in a solid material M by hydrolysis, comprising: (i) supplying the solid material M; (ii) melting the solid material M supplied according to (i) in a melting unit U M at a pressure p SM and a temperature T SM to obtain a liquid stream S M ; (iii) supplying a liquid aqueous stream S SW having a pressure p SW and a temperature T W ; (iv) mixing the stream S M obtained according to (ii) with the stream S W supplied according to (iii) in a pre-reaction unit U PR to obtain a liquid reaction feed stream S SF having a pressure p SF and a temperature T F ; (v) supplying the stream S F obtained according to (iv) into a chemical reaction unit U R ; (vi) subjecting the stream S R in the chemical reaction unit U F to the depolymerization pressure p of polyamide 6D The depolymerization temperature of polyamide 6 is T D A polyamide 6 containing ε-caprolactam is subjected to depolymerization conditions, and an aqueous depolymerized mixture containing ε-caprolactam dissolved in water is subjected to U R Steps to be taken inside, (vii)U R From the aqueous liquid reactor outlet stream S R The step of extracting stream S R However, the step involves a solution of ε-caprolactam in water and This includes, where 0.8 ≤ T SF / T D ≤ 1.05, and 0.9 ≤ p SF / p D The value is ≤ 1.05 for the process.

[0006] Preferably, according to the present invention, Stream S is subjected to the depolymerization conditions of hydrolyzed polyamide 6 according to (vi). F No depolymerization catalysts for polyamide 6, such as one or more mineral acids (e.g., hydrochloric acid, nitric acid, sulfuric acid, and phosphoric acid), and / or zinc salts (e.g., zinc chloride, zinc acetate, or zinc triflate) are added to prepare the product.

[0007] Preferably, 0.6 ≤ T SM / T SF ≤ 1.05 and ≤ 0.9 p SM / p SF ≤ 1.05. According to the present invention, one or more of the following ranges may be preferred: 0.6 ≤ T SM / T SF ≤0.7; 0.7≦T SM / T SF ≤0.8; 0.8≦T SM / T SF ≤0.9; 0.9≦T SM / T SF ≤1.0; 1.0 ≤T SM / T SF ≤1.05.

[0008] More preferably, 0.8 ≤ T SW / T SF≤ 1.3 and 0.9 ≤ p SW / p SF ≤ 1.05. Furthermore, according to the present invention, one or more of the following ranges may be preferred: 0.8 ≤ T SW / T SF ≤0.9; 0.9≦T SW / T SF ≤1.0; 1.0 ≤T SW / T SF ≤1.1; 1.1≦T SW / T SF ≤1.2; 1.2≦T SW / T SF ≤ 1.3.

[0009] (iv) Preliminary reaction unit U PR Regarding pressure p SF At temperature T SF Liquid reaction supply stream S F There are no particular restrictions as long as you can obtain the preliminary reaction unit U according to (iv). PR The system comprises, more preferably consisting solely of, a mixing unit, the mixing unit being a static mixing unit. As used herein, the term “static mixing unit” refers to an arrangement of mixing elements installed within a pipe or duct that operates essentially without moving parts, preferably entirely without moving parts. According to the present invention, Stream S M Pipes and streams for S W It may be preferable to configure it as a suitable pipe joint with a pipe for that purpose, and no specific mixed element is present.

[0010] According to the present invention, S W and S M However, the mixing ratio (m) is in the range of 1:1 to 20:1, more preferably in the range of 2:1 to 15:1, and more preferably in the range of 5:1 to 10:1. W / kg) / (m P U PR It is preferable that they be mixed in, where m W is S W This is the amount of water contained in, and m Pis S M This is the amount of polyamide 6 contained in the product. Preferred ranges are, for example, 5:1 to 6:1, or 6:1 to 7:1, or 7:1 to 8:1, 8:1 to 9:1, or 9:1 to 10:1.

[0011] (ii) Melting unit U M Regarding pressure p SM At temperature T SM Liquid Stream S M There are no particular restrictions as long as it can be obtained. Preferably, a melting unit U according to (ii). M The melting unit U comprises a kneader or extruder, more preferably an extruder, and more preferably according to (ii). M It consists only of an extruder, more preferably the extruder is a single-screw extruder or a twin-screw extruder, more preferably a twin-screw extruder. More preferably supplied according to (i) and T SM A solid material M having a lower temperature than is supplied into the extruder and melted therein as it is conveyed through the extruder. Preferably, the temperature of the solid material supplied into the extruder is in the range of 10 to 50°C, more preferably 15 to 40°C, and more preferably 20 to 30°C. Even more preferably, the solid material is supplied into the extruder at a pressure in the range of 0.75 to 5 bar, more preferably 0.85 to 3 bar, and more preferably 0.95 to 1.5 bar. To melt the material M, the extruder is preferably equipped with appropriate heating means for heating each of the material M, and as it exits the extruder, a liquid stream S M is temperature T SM The extruder has the following features. The appropriate heating means can be arranged such that the extruder has one heating zone or two or more heating zones. To supply the solid material M, the extruder may have two or more feeding zones. Furthermore, according to the present invention, the extruder can operate with either a starved feed or a flooded feed.

[0012] Preferably, melting unit U M, preferably, the extruder is equipped with a degassing system that helps remove one or more gases during the melting process in the extruder. The extruder is generally considered to have two or more degassing zones, but preferably has one degassing zone. Preferably, the degassing zone is located immediately before the pressure increase in the extruder discharge zone. Melting unit U M , preferably, when the extruder is equipped with a degassing system, the process preferably removes gas stream S M from U GM during melting according to (ii). Preferably, the gas stream S GM has a temperature T GM at pressure p GM such that 0.95 ≦ T GM / T SM ≦ 1.05, preferably 0.95 ≦ T GM / T SM ≦ 1.0. Preferably, according to the present invention, the stream S M obtained from the melting unit U GM is subjected to scrubbing, preferably one or more of wet scrubbing and dry scrubbing, more preferably wet scrubbing, in the scrubbing unit U S . The wet scrubbing preferably includes passing the gas stream S GM through a scrubbing column, preferably a packed scrubbing column. Before being subjected to scrubbing, the stream S M obtained from the melting unit U GM is preferably subjected to cooling, preferably in a vacuum system where the stream S GM is preferably withdrawn from the melting unit U M .

[0013] According to the present invention, the stream S M has a pressure p SM , and the pressure p SM is preferably in the range of 0.9 ≦ p SM / p SF ≦ 1.05, and p SF is 0.9 ≦ pSF / p D The range is ≤1.05. As will be described later, the depolymerization pressure p of polyamide 6 D The pressure is preferably in the range of 40 to 140 bar. Therefore, according to the present invention, the pressure p SM The solid material M is melted into the molten unit U M The pressure supplied to the melting unit U is preferably higher, more preferably significantly higher, than the pressure supplied to the extruder. According to the present invention, this pressure increase can be considered to be achieved in the extruder itself. However, in order to achieve the pressure increase, the melting unit U M It is particularly preferable that this is achieved by a suitable compression device included, for example, a compression device located downstream of the extruder. According to this preferred configuration, the liquid stream leaving the extruder is at essentially the same pressure as the solid material supplied to the extruder, and the liquid stream is then appropriately compressed within the compression device to a pressure p SM At temperature T SM Stream S M It is preferable to bring about the following. Preferably, according to the present invention, the compression device comprises at least one suitable gear pump, more preferably consisting only of them, with two or more gear pumps installed, and preferably at least two gear pumps arranged in series.

[0014] Furthermore, according to the present invention, a liquid aqueous stream S according to (iv) W Before being mixed with, molten unit U M Liquid stream S coming out M filter unit U F It may be preferable to pass it through to the molten unit U. Preferably, M Downstream of reaction unit U R Upstream of that, filtration unit U F Particles having a particle size preferably in the range of 100 to 500 micrometers, preferably in the range of 200 to 400 micrometers, are infused into the liquid stream S. M Filtration unit U for separation F The liquid stream S is placed in place, and this process proceeds according to (iv) before mixing.M to U F This includes the step of passing it through the molten unit U. M If the compression device is equipped as described above, the liquid stream, preferably the liquid stream obtained from the extruder, passes through the filter device U before the stream passes through the compression device. F It may be preferable to pass through this point.

[0015] Furthermore, according to the present invention, the melting unit U M The system can be equipped with two or more melting devices, preferably two or more extruders, for example, two or more extruders can be arranged in parallel.

[0016] Regarding the depolymerization conditions for polyamide 6 according to (vi), T D The temperature is in the range of 230 to 330°C, and p D Preferably, the pressure is in the range of 40 to 140 bar, and more preferably T D The temperature is in the range of 250 to 320°C, and p D The pressure is in the range of 40 to 125 bar, and more preferably T D The temperature is in the range of 270 to 310°C, and p D The range is from 40 to 110 bar.

[0017] Therefore, T D A preferred range is, for example, 270 to 280°C, or 280 to 290°C, or 290 to 300°C, or 300 to 310°C, and p D A preferred range is, for example, 40 to 55 bar, or 55 to 70 bar, or 70 to 85 bar, or 85 to 100 bar, or 100 to 110 bar.

[0018] According to the present invention, reaction unit U according to (v) R It comprises at least one reactor, in which a liquid stream S F The reaction unit U is subjected to depolymerization conditions according to (vi). Preferably, reaction unit U according to (v) R This is z chemical reactors Ri The reaction unit U according to (v) is provided, where i=1...z, and z is in the range of 1 to 10, preferably 1 to 8, more preferably 1 to 6, more preferably 1 to 5, more preferably 1 to 4, and more preferably 1 to 3. R It comprises three reactors R1, R2, and R3.

[0019] (v) Reaction unit U R two or more reactors R i If the reactor R is provided, i.e., z > 1, then at least two reactors R i Preferably all z reactors R i It is preferable that they are connected in series, where, - According to (v), stream S F is R i It is supplied to, where i=1, - Aqueous liquid stream S containing ε-caprolactam dissolved in water i is reactor R i Removed from reactor R i+1 It is supplied to, and here i <zであり、 - According to (vii), an aqueous liquid stream S containing ε-caprolactam dissolved in water. z Stream S R Reactor R z Taken out from, Here, all reactors R i In this case, the depolymerization pressure p Di At the depolymerization temperature T Di These are maintained and are independent of each other, T Di The temperature range is 230 to 330°C, and p Di The pressure is in the range of 40 to 140 bar, preferably T Di The temperature range is 250 to 320°C, and p Di The pressure is in the range of 40 to 125 bar, more preferably T Di The temperature range is 270 to 310°C, and p DiThe pressure ranges from 40 to 110 bar. Regarding the preferred arrangement of the three reactors R1, R2, and R3, it is preferable that these three reactors are connected in series, where, - According to (v), stream S F It is supplied to R1, - The aqueous liquid stream S1 containing ε-caprolactam dissolved in water is removed from reactor R1 and supplied to reactor R2. - The aqueous liquid stream S2 containing ε-caprolactam dissolved in water is withdrawn from reactor R2 and supplied to reactor R3. - According to (vii), aqueous liquid stream S3 containing ε-caprolactam dissolved in water is stream S R It was then removed from reactor R3, Here, in reactor R1, the depolymerization pressure p D1 At the depolymerization temperature T D1 T D1 The temperature range is 230 to 330°C, and p D1 The pressure is in the range of 40 to 140 bar, preferably T D1 The temperature range is 250 to 320°C, and p D1 The pressure is in the range of 40 to 125 bar, more preferably T D1 The temperature range is 270 to 310°C, and p D1 The range is 40 to 110 bar, T D1 A preferred range is, for example, 270 to 280°C, or 280 to 290°C, or 290 to 300°C, or 300 to 310°C, and p D1 The preferred ranges are, for example, 40 to 55 bar, or 55 to 70 bar, or 70 to 85 bar, or 85 to 100 bar, or 100 to 110 bar. In reactor R2, the depolymerization pressure p D2 At the depolymerization temperature T D2 T D2 The temperature range is 230 to 330°C, and p D2 The pressure is in the range of 40 to 140 bar, preferably T D2The temperature range is 250 to 320°C, and p D2 The pressure is in the range of 40 to 125 bar, more preferably T D2 The temperature range is 270 to 310°C, and p D2 The range is 40 to 110 bar, T D2 A preferred range is, for example, 270 to 280°C, or 280 to 290°C, or 290 to 300°C, or 300 to 310°C, and p D2 The preferred ranges are, for example, 40 to 55 bar, or 55 to 70 bar, or 70 to 85 bar, or 85 to 100 bar, or 100 to 110 bar. In reactor R3, the depolymerization pressure p D3 At the depolymerization temperature T D3 T D3 The temperature range is 230 to 330°C, and p D3 The pressure is in the range of 40 to 140 bar, preferably T D3 The temperature range is 250 to 320°C, and p D3 The pressure is in the range of 40 to 125 bar, more preferably T D3 The temperature range is 270 to 310°C, and p D3 The range is 40 to 110 bar, T D3 A preferred range is, for example, 270 to 280°C, or 280 to 290°C, or 290 to 300°C, or 300 to 310°C, and p D3 A preferred range is, for example, 40 to 55 bar, or 55 to 70 bar, or 70 to 85 bar, or 85 to 100 bar, or 100 to 110 bar.

[0020] According to the present invention, if z > 1, there are z reactors R i They are arranged vertically, with R1 being the uppermost reactor, and R z This is the bottom reactor, R i S obtained from i R is caused by gravity, preferably by gravity alone. i+1It is preferable that the S1 obtained from R1 moves to R2 by gravity, preferably by gravity alone, and the S2 obtained from R2 moves to R3 by gravity, preferably by gravity alone.

[0021] One or more reactors R i Regarding the specific design, at least one reactor R i It is preferable that the reactors are stirred tank reactors, and more preferably all z reactors are stirred tank reactors. With regard to the preferred arrangement of the three reactors R1, R2, and R3, it is preferable that reactors R1, R2, and R3 are stirred tank reactors.

[0022] There are no general limitations on the specific design of the agitated tank reactor, however, according to the present invention, at least one agitated tank reactor R i Preferably all stirred tank reactors R i The reactor R preferably has 2 to 6 compartments, more preferably 2 to 5 compartments, and more preferably 2 to 4 compartments, which are independent of each other, and the compartments are preferably arranged in series, more preferably in series and vertically, and it is particularly preferable that two adjacent compartments are separated by a partition including at least one flow opening. Preferably, reactor R i At least one section included in the reactor is equipped with at least one stirrer, and more preferably all reactors R i All sections are equipped with at least one stirrer, and more preferably all reactors R iEach compartment is equipped with one agitator, and the process includes the step of stirring the depolymerized mixture in a given compartment for at least a portion of the time while it is subjected to depolymerization conditions in the compartment. With regard to the preferred arrangement of the three reactors R1, R2, and R3, it is more preferable that the stirred tank reactor R1 has three compartments arranged vertically and in series, all of which are equipped with agitators, the stirred tank reactor R2 has three compartments arranged vertically and in series, all of which are equipped with agitators, and the stirred tank reactor R3 has three compartments arranged vertically and in series, all of which are equipped with agitators. Refer in particular to Figure 5 of the present invention and its respective descriptions.

[0023] Alternatively, regarding the specific design of the agitated tank reactor, according to the present invention, at least one agitated tank reactor R i Preferably all stirred tank reactors R i The reactor R has, independently of each other, preferably 2 to 6 compartments, more preferably 2 to 5 compartments, more preferably 2 to 4 compartments, and the compartments are preferably arranged in series, more preferably in series and vertically, and the reactor R i It is particularly preferable that the reactor comprises at least one stirrer, and two adjacent compartments are formed and separated by one or more suitable components of the stirrer, e.g., blades included in the stirrer, and the process includes a step of stirring a depolymerizing mixture in a given compartment for at least a portion of the time it is subjected to depolymerizing conditions in the reactor compartment. More preferably in this regard, with respect to three preferred arrangements of reactors R1, R2, and R3, it is more preferable that the stirred tank reactor R1 has two vertically and in series-arranged compartments formed and separated by the suitable components of the stirrer included in R1, the stirred tank reactor R2 has two vertically and in series-arranged compartments formed and separated by the suitable components of the stirrer included in R2, and the stirred tank reactor R3 has two vertically and in series-arranged compartments formed and separated by the suitable components of the stirrer included in R3.

[0024] Preferably, according to the present invention, the depolymerization conditions for polyamide 6 according to (vi) are, Unit U R Preferably z reactors R i More preferably, the total residence time t of the aqueous depolymerization mixture in z stirred tank reactors D The mixture further comprises at least 85% by weight, preferably at least 90% by weight, and more preferably at least 95% by weight of the aqueous depolymerization mixture, in the range of 30 to 90 minutes. D The term "total residence time" as used in this context of the present invention applies to all of the above chemical reactors R i This refers to the total residence time of the reactor R, especially when z > 1. i The residence time of the aqueous depolymerization mixture inside is t Di Therefore, 0.90≦(t Di / t Di+1 )≦1.10, preferably 0.95≦(t Di / t Di+1 It is preferable that ) ≤ 1.05. Therefore, according to the present invention, it is preferable that a narrow residence time distribution is achieved. With respect to a preferred arrangement of the three reactors R1, R2, and R3, the residence time of the aqueous depolymerization mixture in reactor R1 is t D1 Therefore, the residence time of the aqueous depolymerization mixture in reactor R2 is t D2 Therefore, the residence time of the aqueous depolymerization mixture in reactor R3 is t D3 Therefore, 0.90≦(t D1 / t D2 )≦1.10, preferably 0.95≦(t D1 / t D2 )≦1.05, and 0.90≦(t D2 / t D3 )≦1.10, preferably 0.95≦(t D2 / t D3 It is more preferable that ) ≤ 1.05.

[0025] Preferably, according to the present invention, reactor R i At least one of, preferably all of, reactors R i Each reactor R i One or more outlet means for extracting the gas stream from each reactor Ri It has an outlet means for degassing. Therefore, the process of the present invention preferably has at least one reactor R i Therefore, preferably all z reactors R i From each gas stream S Gi pressure p Gi At temperature T Gi A given gas stream S having Gi This includes the step of extracting , 0.95≦T Gi / T Di The value is ≤1.05. Regarding the preferred arrangement of the three reactors R1, R2, and R3, the process is more preferably carried out from R1 to the gas stream S G1 The step of extracting S G1 pressure p G1 At temperature T G1 It has such that 0.95 ≤ T G1 / T D1 Steps ≤ 1.05 and gas stream S from R2 G2 The step of extracting S G2 pressure p G2 At temperature T G2 It has such that 0.95 ≤ T G2 / T D2 Steps ≤ 1.05 and from R3 to gas stream S G3 The step of extracting S G3 pressure p G3 At temperature T G3 It has such that 0.95 ≤ T G3 / T D3 The process includes a step in which the gas stream S is ≤ 1.05. According to the present invention, the process is preferably carried out as described above. GM Before subjecting it to scrubbing, the gasstream S Gi At least one, more preferably all, streams S Gi , more preferably gas stream S G1 S G2 , and S G3 As described above, gas stream S GM It may be preferable to further include a step of combining with

[0026] In general, there are no specific restrictions on how the solid material M is supplied according to (i). Preferably, the solid material M is supplied according to (i). (i.1) Delivery unit U MD A step of supplying a solid material M inside, U MD Preferably, the system includes one or more of the following steps: at least one big bag station and at least one bulk container station. (i.2) The solid material M supplied according to (i.1) is connected to unit U via the first connection line. MD From material collection unit U MC Preferably, the step is to pass the material to a collection drum, wherein the first connection line preferably connects to at least one material receiving / discharging unit U MRD , at least one first material supply unit U FMF , and at least one first particle separation unit U FMPS A step that includes one or more of the following, (i.3) Solid material M into unit U MC From the second connection line to unit U M A step of passing through, wherein the second connection line preferably passes through at least one second material supply unit U SMF , at least one second particle separation unit U SMPS , and a step comprising one or more of at least one metal detector, Includes.

[0027] Preferably, the first connection line by (i.2) is at least one unit U MRD Preferably comprising at least one hopper, more preferably at least one 1-zone hopper, and at least one unit U FMF Preferably further comprising at least one rotary feeder, and preferably at least one particle separation unit U FMPS , more preferably comprising at least one filter, and more preferably at least one mesh filter.

[0028] More preferably, the solid material M is connected to unit U via the first connection line. MD From Unit U MC To pass through, at least one gas stream S G The gas passes through a first connection line, and the at least one gas stream preferably contains air or dilute air, more preferably consisting only of these, wherein, prior to passing through the first connection line, the at least one gas stream is pretreated preferably by at least one of filtration, compression, and cooling, more preferably by filtration, compression, and cooling.

[0029] More preferably, the second connection line according to (i.3) preferably comprises a rotary feeder and a weight loss feeder, and more preferably, the rotary feeder comprises at least two units U located upstream of the weight loss feeder. SMF It is equipped with and unit U SMPS Preferably, it further comprises a vibrating screen.

[0030] Preferably, according to (i), the solid material M is supplied in the form of particles, preferably U M The particles are supplied to a system where the particle size distribution is preferably characterized by one or more pairs of the following values, preferably two or more pairs of the following values, and more preferably three pairs of the following values: - D10 values ​​for particle widths in the range of 0.3 to 15 mm, and D10 values ​​for particle lengths in the range of 0.3 to 15 mm. - D50 values ​​for particle widths in the range of 0.5 to 20 mm, and D50 values ​​for particle lengths in the range of 0.5 to 20 mm. - D90 values ​​for particle widths ranging from 0.8 to 30 mm and D90 values ​​for particle lengths ranging from 0.8 to 30 mm.

[0031] A more preferable pair of values ​​would be, for example, - D10 values ​​for particle widths in the range of 2 to 4 mm, and D10 values ​​for particle lengths in the range of 3.5 to 5.5 mm. - D50 values ​​for particle widths in the range of 2.5 to 4.5 mm and D50 values ​​for particle lengths in the range of 4 to 7 mm. - D90 values ​​for particle widths ranging from 3 to 5 mm, and D90 values ​​for particle lengths ranging from 4.5 to 8.5 mm. That is the case.

[0032] As used in this context of the present invention, the term "particles" may optionally include pre-formed granules and also include fine fragments.

[0033] Preferably 10 to 100% by weight, more preferably 30 to 100% by weight, more preferably 50 to 100% by weight, more preferably 60 to 100% by weight, more preferably 70 to 100% by weight, and more preferably 80 to 100% by weight of the solid material M supplied according to (i) consists solely of polyamide 6. If the polyamide 6 content of the solid material M is less than 100% by weight, the solid material M may preferably further contain one or more elastanes. Generally, the solid material M may, in addition to polyamide 6, contain at least one further polymer compound, which preferably includes at least one polyamide 6.6; at least one semi-aromatic polyamide including one or more of polyamide 6T and polyamide 6I; at least one polyethylene terephthalate; at least one polyurethane; at least one polyester; at least one polyether; at least one polyvinyl chloride; at least one natural fiber material, e.g., wool and cotton; at least one cellulose material; at least one natural elastomer; at least one synthetic elastomer; at least one copolymer of two or more of the polymer compounds including statistical copolymers, gradient copolymers, alternating copolymers, block copolymers, and graft copolymers; and at least one rubber material including one or more of at least one natural rubber material and at least one synthetic rubber material. Furthermore, in addition to polyamide 6, the solid material M may further contain at least one pigment material and at least one glass fiber material.

[0034] Preferably, the solid material M supplied according to (i) comprises one or more of waste, more preferably textile waste and engineering plastic waste, more preferably textile waste, and more preferably only therein. Generally, the solid material M supplied according to (i) may consist of a single material or several different materials, i.e., w chemical materials M j It consists of, where j=1..w and w≧1. Furthermore, according to the present invention, preferably the chemical material M j At least one, more preferably all, of the chemical materials M j This includes, preferably consists solely of, waste, and the waste preferably includes, preferably at least one fiber waste. If w > 1, each of the two or more materials may have different chemical compositions, provided that the solid material M has the composition described above, and is not subject to any particular limitations.

[0035] According to the present invention, a liquid aqueous stream S supplied according to (iii) W Preferably, 90 to 100% by weight, more preferably 91 to 100% by weight, more preferably 92 to 100% by weight, more preferably 93 to 100% by weight, more preferably 94 to 100% by weight, and more preferably 95 to 100% by weight consist solely of water. A more preferred range may be 96 to 100% by weight, or 97 to 100% by weight, or 99 to 100% by weight, or 99 to 100% by weight.

[0036] Preferably, according to the present invention, a liquid aqueous stream S according to (iii). W To supply stream S R The steps of generating an aqueous stream containing at least a portion of the water contained therein, and generating an aqueous stream S containing at least a portion of the generated aqueous stream. W Chemical reaction unit U as or as part thereof R This includes the step of supplying and returning the product.

[0037] Regarding the reuse of the aforementioned water, for example, this process uses a chemical reaction unit U R Stream S obtained from R Depending on the choice, S R After being subjected to filtration, it is subjected to hot water separation to obtain aqueous stream S X Steps to obtain, and Aqueous Stream S X At least a portion of it is water-based Stream S W As part of the chemical reaction unit U R The steps include supplying and returning to the aqueous stream S, wherein the hot water separation may preferably include one or more of distillation and flowing membrane evaporation. Preferably, the aqueous stream S X To generate reaction unit U R Stream S obtained from R Depending on the choice, S R After being filtered, it is distilled and then Stream S X The step of obtaining the distillation may include the following steps: The distillation may preferably be carried out in a distillation column, with a bottom temperature preferably in the range of 70 to 140°C, more preferably in the range of 80 to 120°C, more preferably in the range of 90 to 110°C, and a top pressure preferably in the range of 0.5 to 1.5 bar, more preferably in the range of 0.7 to 1.2 bar, more preferably in the range of 0.8 to 1.1 bar, and the stream S X This is obtained at the top of the distillation column. Furthermore, the distillation preferably involves condensing the vapor top stream and the liquid stream S X The step may include obtaining a liquid stream S X At least a portion of it is Aqueous Stream S W As part of the chemical reaction unit U R The liquid stream S obtained by condensation is supplied and returned. X It may preferably be divided into two streams, the first stream obtained from the division being the aqueous stream S W As part of the chemical reaction unit U RThe first stream is supplied and returned to the top of the distillation column, and the volume ratio of the first stream to the second stream is preferably in the range of 10:1 to 0.5:1, more preferably in the range of 7:1 to 1:1, and more preferably in the range of 5:1 to 2:1.

[0038] With regard to the reuse of the aforementioned water, according to the process of the present invention, (vii) the stream S R is, concentration c SR It contains ε-caprolactam dissolved in water, and Stream S R It contains one or more impurities, and the process involves the following steps: (viii) Liquid Aqueous Stream S R Evaporation unit U E Pass it through, S R From, c SL >c SR The concentration c SL Aqueous aqueous Stream S containing ε-caprolactam dissolved in water L Having obtained S R From one or more water vapor streams S V Steps to obtain, (ix) Water-based Stream S L Heat consumption purification unit U P Pass it through, S L From, c SCPL >>c SL The concentration c SCPL Stream S containing ε-caprolactam CPL Having obtained S L From one or more water-based stream S RW A step to obtain U P At least a portion of the heat consumed is used by one or more streams S V Supplied by at least one of the streams S V From, at least one partially condensed aqueous stream S VW To obtain, steps, (x) at least partially at least one stream S VW reaction unit U RTo be reused and recycled, at least partially, at least one stream S RW reaction unit U R The recycling step, It is preferable to further include the following.

[0039] Recycling by (x) is preferably, (x.1) at least one stream S VW and at least one stream S RW water treatment unit U W To supply U W From at least one Aqueous Recycle Stream S W Steps to obtain, (x.2) At least one aqueous stream S W at least partially react unit U R The steps to recycle Includes.

[0040] Water treatment unit U W Preferably, the water recovery unit U WR and wastewater unit U WW (x.1) preferably comprises the following steps: (x.1.1) at least one stream S VW and at least one stream S RW Water recovery unit U WR To supply U WR From at least one Aqueous Recycle Stream S W and at least one aqueous stream S SW Steps to obtain, (x.1.2) at least one stream S SW wastewater unit U WW To supply U WW From at least one wastewater stream S WW Steps to obtain It also includes.

[0041] Purification Unit U P Preferably, the heat consumption water separation unit U WS, heat consumption distillation unit U D , and heat consumption crystallization unit U C One or more of the following, Comfortable Heat Consumption Water Separation Unit U WS , heat consumption distillation unit U D , and heat consumption crystallization unit U C Two or more of the following, Comfortable Heat Consumption Water Separation Unit U WS , heat consumption distillation unit U D , and heat consumption crystallization unit U C Equipped with U WS , U D , and U C At least a portion of the heat consumed by one or more of them is transferred to one or more streams S V It is provided by at least one of the following.

[0042] Such a refining unit U P Regarding this, the process preferably includes one or more of (a-1), (a-2), and (a-3), more preferably at least two or more of (a-1), (a-2), and (a-3), more preferably (a-1), (a-2), and (a-3): (a-1)U WS From at least one at least partially condensed aqueous stream S VW1 Steps to obtain (a-2)U D From at least one at least partially condensed aqueous stream S VW2 Steps to obtain (a-3)U C From at least one at least partially condensed aqueous stream S VW3 Steps to obtain. Here, the process is defined as one or more S as defined in Embodiment 29. VW1 S VW2 , and S VW3 Preferably two or more S VW1 S VW2 , and S VW3 , more preferably, S VW1 S VW2 , and S VW3water treatment unit U W The process further includes the step of supplying to [the appropriate device / factory].

[0043] Preferably, Stream S RW At least one of U WS It is obtained from.

[0044] Preferably, purification unit U P This is a heat-consuming water separation (heat-consuming water separation) unit U WS , a heat-consuming distillation (heat-consuming distillation) unit U D , and a heat-consuming crystallization (heat-consuming crystallization) unit U C This process is equipped with a concentration c SL Stream S containing ε-caprolactam L to U WS The steps of supplying to U WS From concentration c UWS Stream U containing ε-caprolactam WS Steps to obtain and Stream S UWS distillation unit U D The steps of supplying to U D From concentration c UD Stream S containing ε-caprolactam UD Steps to obtain and Stream S UD Crystallization unit U C The steps of supplying to U C From concentration c SCPL Stream S containing ε-caprolactam CPL The step of obtaining c SL <c UWS <c UD <c SCPL That is the case.

[0045] Preferably, water separation unit U WS This includes at least two heat-consuming water separation subunits U WS1 and U WS2 More preferably, two heat-consuming water separation subunits U coupled in series. WS1 and U WS2 Equipped with, here, Stream S L Preferably UWS1 It is supplied to U WS1 and U WS2 At least a portion of the heat consumed in one or more of them is preferably distributed to one or more streams S V It is provided by at least one of the following.

[0046] Such water separation unit U WS In this case, the process preferably includes one of (b-1) and (b-2), preferably (b-1) and (b-2): (b-1)U WS1 From at least one at least partially condensed aqueous stream S VW11 Steps to obtain (b-2)U WS2 From at least one at least partially condensed aqueous stream S VW12 Steps to obtain.

[0047] Furthermore, such water separation unit U WS In this case, at least one Aqueous Stream S RW1 However, U WS1 Obtained from and at least one aqueous stream S RW2 However, U WS2 Obtained from, and S RW1 and S RW2 At least one of the following, preferably S RW1 and S RW2 U W It is preferable to supply it to.

[0048] Furthermore, such water separation unit U WS Regarding U WS1 Downstream of U WS2 upstream of separation unit U I It is preferable that the following are arranged, and this process is preferably U WS1 From Water-based Stream S UWS1 Steps to obtain and Stream S UWS1 Separating unit U I The steps of supplying to U I From Water-based Stream S UISteps to obtain and Stream S UI Unit U WS2 The step of supplying to U I In this case, one or more of the impurities are S UWS1 Separated from, thereby U I From impurity stream S I Having obtained the above impurities, preferably according to (vii), S R It contains at least one impurity.

[0049] Preferably, evaporation unit U E The process comprises two or more evaporation subunits, and preferably has at least two vapor streams S V1 and S V2 Steps to obtain and steam stream S V1 The steps include passing the steam stream S through at least one heat consumption unit and passing it through the steam stream S V2 The steam stream S includes the step of passing it through at least one heat consumption unit. V1 and S V2 They differ from each other in either pressure and / or temperature.

[0050] Preferably, U R Downstream, at least one solid-liquid separation unit is located in stream S L and S R Preferably, at least one of these passes through at least one solid-liquid separation unit before being passed to the next downstream unit.

[0051] According to the present invention, the solid material M supplied in accordance with (i) preferably comprises one or more waste materials, preferably textile waste and engineering plastic waste, more preferably textile waste, and preferably consists solely of such materials.

[0052] The above stream S CPL That is, with respect to the purified ε-caprolactam stream, the aforementioned stream S CPL This is the Polyamide 6 Manufacturing Unit U PPIt is preferable to pass it through and use it there as starting material. If necessary, one or more further streams S NCPL to U PP The stream can be further passed through, and the aforementioned stream contains non-reused (not recycled) ε-caprolactam, i.e., ε-caprolactam from a conventional source. The prepared polyamide 6 materials are then preferably unit U TP It may be passed through a stream, where it is used as a starting material for preparing a material containing polyamide 6, preferably a fibrous material containing polyamide 6. If necessary, one or more further streams S NPA6 to U TP It can be further passed through, and the stream contains non-recycled polyamide 6, i.e., polyamide 6 from a conventional source. TP Depending on the type of material being prepared, a further stream containing one or more starting materials other than polyamide 6 may also be used. TP It can then be passed through. Next, the material, preferably U TP Fiber material M obtained from T However, preferably it is available on the market, and given a useful life T MT It remains there for a while. Afterwards, each material that has reached the end of its service life is collected in collection unit U TC Preferably, the material is appropriately collected in a fiber material collection unit, and thereafter, as a solid material M, or as part of a solid material M, it is optionally sorted as described herein and then appropriately passed through the above-described process.

[0053] Therefore, according to the present invention, the process preferably involves stream S CPL Polyamide 6 manufacturing unit U PP The step may further include supplying to U PP The polyamide 6 produced is preferably from the fiber material manufacturing unit U TP It is supplied as raw material to its unit U TP from, (A) Textile materials M brought into the market T The above fiber material M is obtained. T Useful life TMT Afterwards, at least partially as textile waste, textile material collection unit U TC Collected, (B) Remaining ingredients M R It is obtained as textile waste, At least a portion of the textile waste from (A), or at least a portion of the textile waste from (B), or at least a portion of the textile waste from (A) and at least a portion of the textile waste from (B) are U M via U R It will be provided appropriately.

[0054] Therefore, the present invention also provides for preparing polyamide 6, which can be obtained or obtained by the above process. CPL With regard to the use of the above, the use preferably further includes the step of using the polyamide 6 as a feed material for preparing a fibrous material.

[0055] Furthermore, the present invention also relates to a method for preparing polyamide 6, wherein the method uses as a starting material S which can be obtained or obtained by the method described above. CPL The method includes a step of using, and preferably further includes a step of using the polyamide 6 as a feed material for preparing a fibrous material.

[0056] Furthermore, according to the present invention, the process is preferably carried out by a polyamide 6 manufacturing unit U PP Stream S CPL The further step includes supplying U PP The polyamide 6 manufactured is preferably produced in the engineering plastics material manufacturing unit U EP It is supplied as raw material to its unit U EP from, (A) Engineering plastic materials M brought to market E The engineering plastic material M is obtained. E Useful life T MEAfterwards, at least partially as engineering plastic waste, engineering plastic collection unit U EC Collected, (B) Remaining ingredients M R It is obtained as engineering plastic waste. At least a portion of the engineering plastic waste from (A), or at least a portion of the engineering plastic waste from (B), or at least a portion of the engineering plastic waste from (A) and at least a portion of the engineering plastic waste from (B) are preferably U M via S M as U R It will be provided appropriately.

[0057] Therefore, the present invention also provides for preparing polyamide 6, which can be obtained or obtained by the above process. CPL With regard to the use of the said use, the said use preferably further includes the step of using the polyamide 6 as a feed material for preparing engineering plastic materials.

[0058] Furthermore, the present invention also relates to a method for preparing polyamide 6, wherein the method uses as a starting material S that can be obtained or obtained by the above process. CPL The method includes using, and preferably further includes the step of using the polyamide 6 as a feedstock for preparing an engineering plastic material.

[0059] In a further embodiment, the present invention relates to an integrated process for preparing polyamide 6, (α) Stream S according to the process described herein CPL A step of preparing the stream S CPL However, the step involves purified ε-caprolactam, (β) Stream S CPL Polyamide 6 manufacturing unit U PA Steps to pass through, (γ)U PA Stream S inside CPL When subjected to ε-caprolactam polymerization conditions, U PA From polyamide 6 material M P The steps include obtaining a stream containing water and one or more ε-caprolactam oligomers, (δ) optionally, a stream containing water and one or more ε-caprolactam oligomers is subjected to concentration with respect to one or more ε-caprolactam oligomers in at least one concentration step to obtain a concentrated stream containing water and one or more ε-caprolactam oligomers, (ε) A concentrated stream containing water and one or more ε-caprolactam oligomers is optionally used in the melting unit U described herein. M and water separation subunit U WS2 A step of passing through at least one of the following, This includes information about the integration process.

[0060] Preferably, the stream, which may be concentrated by an optional means, contains water and one or more ε-caprolactam oligomers according to (ε), further comprising ε-caprolactam, i.e., monomeric ε-caprolactam. More preferably, the integration process is (γ)U PA Stream S inside CPL The material was subjected to ε-caprolactam polymerization conditions, and U PA From, polyamide 6 material M P and concentration c EW (W) Water, concentration c EW (C) ε-caprolactam, and total concentration c EW (O) Stream S containing one or more ε-caprolactam oligomers EW Steps to obtain, (δ) Stream S EW A step of subjecting to concentration, (δ.1) Stream S EW to the first concentration unit U C1 In this, it is subjected to concentration, U C1 Therefore, concentration c C1(W) Water, concentration c C1 (C) ε-caprolactam, and total concentration c C1 (O) comprises one or more ε-caprolactam oligomers, where c C1 (W) <c EW (W), c C1 (C)>c EW (C), and c C1 (O)>c EW (O) is the enriched stream S C1 Having obtained U C1 Therefore, concentration c W1 (W>c EW (W) Water-based stream S W1 Steps to obtain (δ.2) Stream S C1 to the second concentration unit U C2 Subjected to concentration in U C2 Therefore, total concentration c C2 (O) comprises one or more ε-caprolactam oligomers, c C2 (O)>c C1 (O) is the enriched stream S C2 Having obtained U C2 Therefore, concentration c W2 (W) Water and concentration c W2 (C) contains ε-caprolactam, where c W2 (W>c W1 (W) and c W2 (C)>c W1 (C) Aqueous Stream S W2 Steps including, (ε) Stream S C2 subunit U M Pass through to Stream S W2 subunit U WS2 Steps to pass through and Includes.

[0061] As described above, polyamide 6 polymerization unit U PA Stream S obtained from EW It contains water, ε-caprolactam monomer, and one or more ε-caprolactam oligomers. Typically, this aqueous stream S EWIt further comprises one or more further organic compounds other than ε-caprolactam monomer and one or more ε-caprolactam oligomers. Therefore, Stream S EW is the total concentration c EW (X) preferably further comprises one or more organic compounds X other than ε-caprolactam and its oligomers, and the process by (δ) comprises the following steps: (δ.1) Stream S EW to the first concentration unit U C1 Subjected to concentration in U C1 Therefore, concentration c C1 (W) Water, concentration c C1 (C) ε-caprolactam, total concentration c C1 (O) one or more ε-caprolactam oligomers, and total concentration c C1 (X) comprises one or more organic compounds X, c C1 (W) <c EW (W), c C1 (C)>c EW (C), c C1 (O)>c EW (O), and c C1 (X)>c EW (X) is the enriched stream S C1 Having obtained U C1 Therefore, concentration c W1 (W>c EW (W) Water-based stream S W1 Steps to obtain, (δ.2) Stream S C1 to the second concentration unit U C2 Subjected to concentration in U C2 Therefore, total concentration c C2 (O) one or more ε-caprolactam oligomers and total concentration c C2 (X) comprises one or more organic compounds X, c C2 (O)>c C1 (O) and c C2 (X)>c C1 (X) is the enriched stream S C2 Having obtained U C2 Therefore, concentration c W2 (W) Water and concentration c W2(C) contains ε-caprolactam, c W2 (W>c W1 (W) and c W2 (C)>c W1 (C) Aqueous Stream S W2 Steps to obtain Includes.

[0062] More preferably, according to the present invention, (γ) is the following step: (γ.1) Stream S CPL and preferably aqueous stream S AQ0 The polymer is passed through the polymerization step ST0, and the crude polyamide 6 product stream S is taken out of ST0. PA1 and Aqueous Stream S WA1 Steps to obtain, (γ.2) Stream S PA1 and preferably aqueous stream S AQ1 The material is passed through the granulation stage ST1, and from ST1, coarse-grained polyamide 6 material M PA2 and Aqueous Stream S WA2 Steps to obtain, (γ.3) Material M PA2 and preferably aqueous stream S AQ2 The material is passed through extraction step ST2, and the granular polyamide 6 material M is purified from ST2. PA3 and Aqueous Stream S WA3 Steps to obtain, (γ.4) Material M PA3 The material is passed through drying stage ST3, and from ST3, polyamide 6 material M P and Aqueous Stream S WA4 Steps to obtain Includes.

[0063] Manufacturing Unit U PA Assuming that some of the polyamide 6 material obtained from does not meet the specifications, this process preferably uses the aforementioned material M PR At least a portion of Unit U M This may further include passing it through.

[0064] The process of the present invention described above may preferably be a continuous process. However, one or more process steps may be carried out in batch mode, and one or more steps may be carried out in semi-continuous mode. [Modes for carrying out the invention]

[0065] The present invention is further described by the following set of embodiments and combinations of embodiments arising from the dependencies and backreferences shown. In particular, it should be noted that in each example in which the scope of an embodiment is referred to, for example in the context of the term, for example, “any one process of Embodiments 1 to 4,” all embodiments within this scope are expressly disclosed to those skilled in the art; that is, the wording of this term should be understood by those skilled in the art as synonymous with “any one process of Embodiments 1, 2, 3, and 4.” Furthermore, it should be explicitly noted that the following set of embodiments represents a well-structured portion of a general description directed toward preferred aspects of the present invention and therefore adequately supports, but does not represent, the claims of the present invention.

[0066] 1. A process for depolymerizing polyamide 6 contained in solid material M by hydrolysis, wherein the process is: (i) A step of supplying a solid material M, (ii) The solid material M supplied according to (i) is melted in the melting unit U M It melts at pressure p SM At temperature T SM Liquid Stream S M Steps to obtain, (iii) pressure p SW At temperature T SW Liquid aqueous stream S W The steps of supplying, (iv)(ii) The stream S obtained according to (iv)(ii) M The stream S supplied according to (iii) W and preliminary reaction unit U PR Mix inside, pressure p SFAt temperature T SF Liquid reaction supply stream S F Steps to obtain, The stream S obtained according to (v)(iv) F chemical reaction unit U R Steps to supply to the inside, (vi) The aforementioned chemical reaction unit U R Stream S inside F The depolymerization pressure p of polyamide 6 D The depolymerization temperature of polyamide 6 is T D A polyamide 6 containing ε-caprolactam is subjected to depolymerization conditions, and an aqueous depolymerized mixture containing ε-caprolactam dissolved in water is subjected to U R Steps to be taken inside, (vii)U R From the aqueous liquid reactor outlet stream S R The step of extracting stream S R However, the step involves a solution of ε-caprolactam in water and This includes, where 0.8 ≤ T SF / T D ≤ 1.05, and 0.9 ≤ p SF / p D A process where the value is ≤ 1.05.

[0067] 2. 0.6≦T SM / T SF ≤ 1.05, and 0.9 ≤ p SM / p SF The process of Embodiment 1, wherein the coefficient is ≤ 1.05.

[0068] 3. 0.8≦T SW / T SF ≤ 1.3 and 0.9 ≤ p SW / p SF The process of Embodiment 1, wherein the coefficient is ≤ 1.05.

[0069] 4. Preliminary reaction unit U according to (iv) PR However, the process comprises any one of Embodiments 1 to 3, which includes, preferably, a mixing unit, preferably a static mixing unit, preferably by itself.

[0070] According to 5.(iv), S W and S M However, the mixing ratio (m) is in the range of 1:1 to 20:1, preferably in the range of 2:1 to 15:1, and more preferably in the range of 5:1 to 10:1. W / kg) / (m P U ( / kg) PR Mixed in m W However, S W This is the amount of water contained in, and m P However, S M The amount of polyamide 6 contained in any one of the processes from Embodiments 1 to 4.

[0071] 6. Melting Unit U M However, the process comprises, preferably by itself, an extruder, preferably a single-screw extruder or a twin-screw extruder, and preferably by itself, any one of the processes of Embodiments 1 to 5.

[0072] 7. Melting Unit U M However, equipped with a degassing system, this process is performed in accordance with (ii) during melting. M From Gasstream S GM The step includes removing the gas stream S GM However, pressure p GM At temperature T GM It has such that 0.95 ≤ T GM / T SM A process of any one of Embodiments 1 to 6, preferably Embodiment 6, where ≤ 1.05.

[0073] 8.U M Gasstream S extracted from GM However, the scrubbing unit U S Within, preferably one or more of wet scrubbing and dry scrubbing, more preferably wet scrubbing, and the wet scrubbing is preferably gas stream S GM The process of Embodiment 7, comprising the step of passing the material through a scrubbing column, preferably a packed scrubbing column.

[0074] 9. Melting Unit U M Downstream and reaction unit U R Upstream of that, filtration unit U F Particles having a particle size preferably in the range of 100 to 500 micrometers, preferably in the range of 200 to 400 micrometers, are infused into the liquid stream S. M Filtration unit U for separation F The following is arranged, and this process is carried out before mixing by (iv), stream liquid stream S M to U F A process any one of embodiments 1 to 8, which includes the step of passing to a certain point.

[0075] According to 10.(vi), T D The temperature is in the range of 230 to 330°C, and p D The pressure is in the range of 40 to 140 bar, preferably T D The temperature is in the range of 250 to 320°C, and p D The pressure is in the range of 40 to 125 bar, and more preferably T D The temperature is in the range of 270 to 310°C, and p D A process in any one of embodiments 1 to 9, wherein the pressure is in the range of 40 to 110 bar.

[0076] 11. Reaction unit U by (v) R However, z chemical reactors R i A process comprising i=1...z, wherein z is in the range of 1 to 10, preferably 1 to 8, more preferably 1 to 6, more preferably 1 to 5, more preferably 1 to 4, and more preferably 1 to 3, any one of embodiments 1 to 10.

[0077] 12. If z > 1, then at least two reactors R i Preferably z reactors R i They are connected in series, - According to (v), stream S F R i It is supplied to, where i=1, - Aqueous liquid stream S containing ε-caprolactam dissolved in water i However, reactor R i Removed from reactor R i+1 It is supplied to, and here, i <zであり、 - According to (vii), an aqueous liquid stream S containing ε-caprolactam dissolved in water. z However, Stream S R Reactor R z Taken out from, Here, all reactors R i In this case, the depolymerization pressure p Di At the depolymerization temperature T Di These are maintained and are independent of each other, T Di The temperature is in the range of 230 to 330°C, and p Di The pressure is in the range of 40 to 140 bar, preferably T Di The temperature is in the range of 250 to 320°C, and p Di The pressure is in the range of 40 to 125 bar, and more preferably T Di The temperature is in the range of 270 to 310°C, and p Di The range is from 40 to 110 bar. Process of Embodiment 11.

[0078] 13. If z > 1, there are z reactors R i They are arranged vertically, with R1 being the top reactor, R z This is the bottom reactor, R i S obtained from i R is due to gravity, preferably by gravity alone. i+1 The process of embodiment 12 moves to the next step.

[0079] 14. At least one, preferably z, reactors R i However, the process is one of the embodiments 11 to 13, which is a stirred tank reactor.

[0080] 15. All stirred tank reactors R iThe process of Embodiment 14, wherein the process has 2 to 6 compartments, preferably 2 to 5 compartments, more preferably 2 to 4 compartments, which are independent of each other, and the compartments are preferably arranged in series, more preferably in series and vertically, and two adjacent compartments are separated by a partition including at least one flow opening.

[0081] 16. Reactor R i At least one section within is equipped with at least one stirrer, preferably all reactors R i All sections are equipped with at least one stirrer, and more preferably all reactors R i The process of Embodiment 15, wherein all compartments are equipped with one stirrer, and the process includes the step of stirring the depolymerized mixture in a given compartment for at least a portion of the time while the compartment is subjected to depolymerization conditions.

[0082] The depolymerization conditions for polyamide 6 according to 17.(vi) are for unit U R Preferably z reactors R i More preferably, the total residence time t of the aqueous depolymerization mixture in z stirred tank reactors D The mixture further comprises at least 85% by weight, preferably at least 90% by weight, and more preferably at least 95% by weight of the aqueous depolymerization mixture, in the range of 30 to 90 minutes. D A process having any one of embodiments 1 to 16, preferably any one of embodiments 11 to 16, more preferably the process of embodiment 15 or 16.

[0083] 18. As far as Embodiment 17 is concerned, it depends on any one of Embodiments 11 to 16, preferably Embodiment 15 or 16, where z > 1, and reactor R i The residence time of the aqueous depolymerization mixture inside is t Di Therefore, 0.90≦(t Di / t Di+1 )≦1.10, preferably 0.95≦(t Di / t Di+1 The process of Embodiment 17, wherein ) ≤ 1.05.

[0084] 19. At least one reactor R i Therefore, preferably all z reactors R i From each gas stream S Gi Take out the gas stream S Gi pressure p Gi At temperature T Gi It has such that 0.95 ≤ T Gi / T Di Any one of the processes from Embodiments 11 to 18, wherein the coefficient is ≤ 1.05.

[0085] 20. Gasstream S GM Before subjecting it to scrubbing as defined in Embodiment 8, the gas stream S Gi At least one of the streams S, preferably all of them Gi The gas stream S defined in Embodiment 7 GM The process of embodiment 19 further includes the step of combining with

[0086] 21.(i) The supply of solid material M is (i.1) Delivery unit U MD A step of supplying a solid material M inside, U MD Preferably, the system comprises one or more of at least one big bag station and at least one bulk container station. (i.2) The solid material M supplied according to (i.1) is connected to unit U via the first connection line. MD From material collection unit U MC Preferably, the step is to pass the material through a collection drum, where the first connection line is preferably at least one material receiving and discharge unit U MRD , at least one first material supply unit U FMF , and at least one first particle separation unit U FMPS A step comprising one or more of the following, (i.3) Solid material M into unit U MC From the second connection line to unit U MThe step involves passing the second connection line through to, preferably, at least one second material supply unit U SMF , at least one second particle separation unit U SMPS The steps include, and comprising one or more of at least one metal detector, A process according to any one of Embodiments 1 to 20, including the process described in any one of Embodiments 1 to 20.

[0087] 22. The first connection line according to (i.2) is connected to at least one unit U MRD Preferably comprising at least one hopper, more preferably at least one 1-zone hopper, and at least one unit U FMF Preferably further comprising at least one rotary feeder, and preferably at least one particle separation unit U FMPS The process of embodiment 21, more preferably comprising at least one filter, and more preferably at least one mesh filter.

[0088] 23. Solid material M is connected to unit U via the first connection line. MD From Unit U MC To pass through, at least one gas stream S G The process of Embodiment 21 or 22, wherein the gas stream passes through a first connection line, and the at least one gas stream preferably contains air or dilute air, more preferably consists only of them, and before passing through the first connection line, the at least one gas stream is pretreated preferably by at least one of filtration, compression, and cooling, more preferably by filtration, compression, and cooling.

[0089] 24. The second connection line according to (i.3) connects to at least two units U SMF Preferably, a unit U comprising at least two units including a rotary feeder and a weight loss feeder. SMF The rotary feeder is located upstream of the weight loss feeder, and unit U SMPSany one of embodiments 21 to 23, preferably further comprising a vibrating screen.

[0090] According to 25.(i), the solid material M is supplied in the form of granules, preferably U M A process from any one of Embodiments 1 to 24 is supplied to such that the particle size distribution of the granules is preferably characterized by one or more pairs of the following values, preferably two or more pairs of the following values, and more preferably three pairs of the following values: - D10 values ​​for particle widths in the range of 0.3 to 15 mm, and D10 values ​​for particle lengths in the range of 0.3 to 15 mm. - D50 values ​​for particle widths in the range of 0.5 to 20 mm, and D50 values ​​for particle lengths in the range of 0.5 to 20 mm. - D90 values ​​for particle widths ranging from 0.8 to 30 mm and D90 values ​​for particle lengths ranging from 0.8 to 30 mm.

[0091] 26. Any one of the processes of Embodiments 1 to 25, wherein 10 to 100% by weight, more preferably 30 to 100% by weight, more preferably 50 to 100% by weight, more preferably 60 to 100% by weight, more preferably 70 to 100% by weight, and more preferably 80 to 100% by weight of the solid material M consists solely of polyamide 6.

[0092] 27.(iii) Liquid aqueous stream S W To supply Stream S R The steps of generating an aqueous stream containing at least a portion of the water contained therein, and generating an aqueous stream S containing at least a portion of the generated aqueous stream. W Chemical reaction unit U as or as part thereof R A process any one of embodiments 1 to 26, comprising the step of supplying and returning.

[0093] According to 28.(vii), stream S R However, concentration c SR It contains ε-caprolactam dissolved in water, and Stream S RHowever, if it contains one or more impurities, this process will proceed as follows: (viii) Liquid Aqueous Stream S R Evaporation unit U E Pass through, S R From, c SL >c SR The concentration c SL Aqueous aqueous Stream S containing ε-caprolactam dissolved in water L Having obtained S R From one or more water vapor streams S V Steps to obtain, (ix) Water-based Stream S L Heat consumption purification unit U P Pass through, S L From, c SCPL >>c SL The concentration c SCPL Stream S containing ε-caprolactam CPL Having obtained S L From one or more water-based stream S RW A step to obtain U P At least a portion of the heat consumed is used by one or more streams S V Provided by at least one of the following, thereby providing at least one stream S V From, at least one partially condensed aqueous stream S VW To obtain, steps, (x) at least partially at least one stream S VW reaction unit U R Recycle to at least partially at least one stream S RW reaction unit U R The recycling steps A process any one of embodiments 1 to 27, further comprising:

[0094] 29. Recycling according to (x) (x.1) at least one stream S VW and at least one stream S RW water treatment unit UW To supply U W From at least one Aqueous Recycle Stream S W Steps to obtain, (x.2) At least one aqueous stream S W at least partially react unit U R The recycling steps The process of Embodiment 28, including the process of Embodiment 28.

[0095] 30. Water Treatment Unit U W However, the water recovery unit U WR and wastewater unit U WW (x.1) is equipped with (x.1.1) at least one stream S VW and at least one stream S RW Water recovery unit U WR To supply U WR From at least one Aqueous Recycle Stream S W and at least one aqueous stream S SW Steps to obtain, (x.1.2) at least one stream S SW wastewater unit U WW To supply U WW From at least one wastewater stream S WW Steps to obtain The process of embodiment 29 further includes the process of embodiment 29.

[0096] 31. Purification Unit U P However, the heat consumption water separation unit U WS , heat consumption distillation unit U D , and heat consumption crystallization unit U C One or more of the following, preferably a heat-consuming water separation unit U WS , heat consumption distillation unit U D , and heat consumption crystallization unit U C Two or more of the following, Comfortable Heat Consumption Water Separation Unit U WS , heat consumption distillation unit U D , and heat consumption crystallization unit U C Equipped with UWS , U D , and U C At least a portion of the heat consumed by one or more of them is transferred to one or more streams S V A process provided by at least one of embodiments 28 to 30.

[0097] 32. A process of Embodiment 31 comprising one or more of (i-1), (i-2), and (i-3) below, preferably at least two or more of (i-1), (i-2), and (i-3), more preferably (i-1), (i-2), and (i-3): (i-1)U WS From at least one at least partially condensed aqueous stream S VW1 Steps to obtain (i-2)U D From at least one at least partially condensed aqueous stream S VW2 Steps to obtain (i-3)U C From at least one at least partially condensed aqueous stream S VW3 Steps to obtain Here, this process involves one or more S as in Embodiment 29. VW1 S VW2 , and S VW3 Preferably two or more S VW1 S VW2 , and S VW3 , more preferably, S VW1 S VW2 , and S VW3 water treatment unit U W The process further includes the step of supplying to [the target].

[0098] 33. Stream S RW At least one of them is U WS A process of embodiment 31 or 32 obtained from.

[0099] 34. Purification Unit U P However, the heat consumption water separation unit U WS , heat consumption distillation unit UD , and heat consumption crystallization unit U C This process is equipped with, and the concentration c SL Stream S containing ε-caprolactam L to U WS The steps of supplying to U WS From concentration c UWS Stream U containing ε-caprolactam WS Steps to obtain and Stream S UWS distillation unit U D The steps of supplying to U D From concentration c UD Stream S containing ε-caprolactam UD Steps to obtain and Stream S UD Crystallization unit U C The steps of supplying to U C From concentration c SCPL Stream S containing ε-caprolactam CPL This includes the step of obtaining c SL <c UWS <c UD <c SCPL The process is one of any two of the embodiments 28 to 33.

[0100] 35. Water Separation Unit U WS However, at least two heat-consuming water separation subunits U WS1 and U WS2 Preferably, two heat-consuming water separation subunits U are coupled in series. WS1 and U WS2 Equipped with Stream S L However, U WS1 It is supplied to U WS1 and U WS2 At least a portion of the heat consumed by one or more of them is transferred to one or more streams S V A process provided by at least one of embodiments 28 to 34.

[0101] 36. A process of Embodiment 35 comprising one or more of (ii-1) and (ii-2), preferably (ii-1) and (ii-2): (ii-1) U WS1 to obtain at least one at least partially condensed aqueous stream S VW11 from (ii-2) U WS2 to obtain at least one at least partially condensed aqueous stream S VW12 from

[0102] 37. At least one aqueous stream S RW1 is obtained from U WS1 and at least one aqueous stream S RW2 is obtained from U WS2 and S RW1 and S RW2 at least one of, preferably S RW1 and S RW2 is supplied to U W The process of embodiment 36.

[0103] 38. Downstream of U WS1 and upstream of U WS2 is located a separation unit U I and the process comprises obtaining an aqueous stream S WS1 from U UWS1 supplying stream S UWS1 to separation unit U I obtaining an aqueous stream S I from U UI supplying stream S UI to unit U WS2 and in U I one or more of the impurities are separated from S UWS1 thereby obtaining an impurity stream S I from U I and said impurities preferably comprise at least one impurity contained in S R according to (vii). The process of any one of embodiments 35 to 37.

[0104] 39. Evaporation unit U EHowever, the process comprises two or more evaporation subunits, and the process has at least two steam streams S V1 and S V2 Steps to obtain and steam stream S V1 The steps include passing the steam stream S through at least one heat consumption unit and passing it through the steam stream S V2 The steam stream S includes the step of passing it through at least one heat consumption unit. V1 and S V2 However, any one of the processes from Embodiments 28 to 38 differs from each other in either pressure and / or temperature.

[0105] 40.U R At least one solid-liquid separation unit is located downstream of the stream, preferably stream S L and S R A process in any one of embodiments 28 to 39, wherein at least one of the components passes through at least one solid-liquid separation unit before being passed to the next downstream unit.

[0106] 41. Polyamide 6 Manufacturing Unit U PP Stream S CPL The further step includes supplying U PP The polyamide 6 produced is preferably from the fiber material manufacturing unit U TP It is supplied as raw material to its unit U TP from, (A) Textile materials M brought into the market T The above fiber material M is obtained. T Useful life T MT Afterwards, at least partially as textile waste, textile material collection unit U TC Collected, (B) Remaining ingredients M R This is obtained as textile waste. At least a portion of the textile waste from (A), or at least a portion of the textile waste from (B), or at least a portion of the textile waste from (A) and at least a portion of the textile waste from (B) are U M via U RA process from any one of embodiments 28 to 40, appropriately supplied to the

[0107] Liquid aqueous stream S supplied in accordance with 42.(iii) W A process of any one of Embodiments 1 to 41, wherein 90 to 100% by weight, preferably 91 to 100% by weight, more preferably 92 to 100% by weight, more preferably 93 to 100% by weight, more preferably 94 to 100% by weight, and more preferably 95 to 100% by weight consists solely of water.

[0108] 43. Any one of the processes from Embodiments 1 to 42, which is a continuous process, a semi-continuous process, or a batch process.

[0109] A process from any one of Embodiments 1 to 43, wherein the solid material M supplied in accordance with 44.(i) comprises one or more waste materials, preferably textile waste and engineering plastic waste, more preferably textile waste, and preferably solely thereof.

[0110] 45. Polyamide 6 can be obtained or obtained by any one process of Embodiments 28 to 44 for preparation of polyamide 6. CPL Use of the polyamide 6, wherein the use preferably further comprises the step of using the polyamide 6 as a feedstock for preparing one or more of fibrous materials and engineering plastic materials, more preferably for preparing fibrous materials.

[0111] 46. ​​A method for preparing polyamide 6, wherein the method can be obtained by any one process of Embodiments 28 to 44 or obtained S CPL A method comprising the step of using as a starting material, wherein the method further comprises the step of using the polyamide 6 as a feedstock for preparing one or more of fibrous materials and engineering plastic materials, more preferably for preparing fibrous materials.

[0112] 47. S which can be obtained by any one process of Embodiments 28 to 44 for preparing one or more polymers and polymer products CPL Use, or A method for preparing one or more polymers and polymer products, wherein the method can be obtained by any one process of Embodiments 28 to 44 or obtained S CPL A method comprising the step of using as a starting material.

[0113] 48. Use or method of Embodiment 47, wherein the polymer, or polymer product, or polymer and polymer product is in the form of at least one of granules, strands, rods, plates, pipes, foils, layers, films, sheets, fibers, filaments, coatings, extruded articles, molded articles, flexible foams, semi-rigid foams, and rigid foams.

[0114] 49. Use or method of Embodiment 47 or 48, wherein the polymer, or polymer product, or polymer and polymer product comprises polyamide 6 and optionally, optionally, at least one further polymer compound, the at least one further polymer compound preferably comprising at least one polyamide 6.6; at least one semi-aromatic polyamide comprising one or more of polyamide 6T and polyamide 6I; at least one polyethylene terephthalate; at least one polyurethane; at least one polyester; at least one polyether; at least one polyvinyl chloride; at least one natural fiber material, e.g., wool and cotton; at least one cellulose material; at least one natural elastomer; at least one synthetic elastomer; at least one copolymer of two or more of the polymer compounds comprising statistical copolymers, gradient copolymers, alternating copolymers, block copolymers and graft copolymers; and one or more of at least one rubber material comprising one or more of the at least one natural rubber material and at least one synthetic rubber material.

[0115] 50. Use or method of any one of Embodiments 47 to 49, wherein the polymer, or polymer product, or polymer and polymer product is one of the following, or part of one of the following: - Automotive parts, preferably cylinder head covers, engine covers, intake radiator housings, intake radiator flaps, intake pipes, intake manifolds, connectors, gear wheels, fan wheels, coolant boxes, heat exchanger housings or housing components, coolant coolers, intake radiators, thermostats, water pumps, radiators, fastening components or parts of battery systems for electric transport, dashboards, steering column switches, seats, headrests, center consoles, transmission components, door modules, automotive exteriors for A, B, C or D pillar covers, spoilers, door handles, exterior mirrors, windshield wipers, windshield wiper protective housings, decorative grilles, cover strips, roof rails, window frames, sunroof frames, antenna panels, headlights, taillights, airbags, and / or cushions; - Cloth, clothing, preferably shirts, trousers, pullovers, boots, shoes, soles, tights and / or jackets; - Electrical components, preferably electrical components, passive electronic components, active electronic components, printed circuit boards, housing components, wheels, lines, switches, e.g., microswitches, plugs, sockets, distributors, relays, resistors, capacitors, inductors, bobbins, lamps, diodes, e.g., LEDs, transistors, connectors, regulators, integrated circuits (ICs), processors, controllers, memory, sensors, microbuttons, semiconductors, e.g., reflector housings for light-emitting diodes, fasteners, spacers, bolts, strips, slide-in guides, screws, nuts, film hinges, snap hooks (snap-ins), and / or spring tongues for electrical and / or electronic components; - Consumer and / or pharmaceuticals, preferably tennis strings, climbing ropes, bristols, brushes, artificial grass, 3D printing filaments, lawnmowers, zippers, hook-and-loop fasteners, paper machine garments, extruded coatings, fishing lines, fishing nets, seabed lines and ropes, vials, syringes, ampoules, bottles, sliding elements, spindle nuts, chain conveyors, plain bearings, rollers, wheels, gears, rollers, ring gears, screws and spring dampers, hoses, pipelines, cable sheaths, sockets, switches, cable ties, fan wheels, carpets, cosmetic boxes and / or bottles, mattresses, cushions, insulation materials; - Packaging for the food industry, preferably single-layer and / or multi-layer inflated films, cast films (single-layer and / or multi-layer), biaxially oriented films, and laminate films.

[0116] 51. Any one use or method of Embodiments 47 to 50, wherein the polymer or polymer product, or the polymer and polymer product, contains polyamide 6 in an amount of 1% by weight or more, preferably 2% by weight or more, more preferably 5% by weight or more, more preferably 15% by weight or more, more preferably 30% by weight or more, more preferably 40% by weight or more, more preferably 60% by weight or more, more preferably 80% by weight or more, more preferably 90% by weight or more, more preferably 95% by weight or more, and / or 100% by weight or less, preferably 95% by weight or less, more preferably 90% by weight or less, more preferably 50% by weight or less, more preferably 25% by weight or less, more preferably 10% by weight or less.

[0117] As far as Embodiment 51 is concerned, the respective amounts are preferably determined based on identity retention and / or separation and / or mass balance and / or book and claims management models, more preferably based on mass balance, and more preferably based on International Sustainability and Carbon Certification (ISCC) standards.

[0118] With respect to embodiments 47 to 51, the preparation of polymers, polymer products, or polymers and polymer products may involve one or more synthetic steps and can be carried out by conventional synthesis and techniques well known to those skilled in the art. Examples of synthetic steps are found in "Industrial Organic Chemistry", Vol. 3, Wiley-VCH, 1997; ISBN: 978-3-527-28838-0; "Kunststoffhandbuch", Vol. 11 of 17 sub-volumes, Carl Hanser Verlag, Vol. 6 in particular; "Polyamides", 1st edition, 1966; "Injection Molding Reference Guide, 4 th This information is contained in the edition, "CreateSpace Independent Publishing Platform," 2011, ISBN: 978-1466407824; International Publication No. 2008 / 155271 and International Publication No. 2013 / 139827, which are incorporated herein by reference, respectively.

[0119] As used herein, the term "bar" refers to "bar(abs)," that is, bar (absolute value), and is sometimes also referred to as "bara."

[0120] As used herein, the term “textile material” encompasses textile and non-textile raw materials processed into linear, planar, and spatial structures by various methods. This includes linear fibrous structures manufactured from textile materials, e.g., yarns, twisted yarns, and ropes; sheet-like fibrous structures, e.g., woven fabrics, knitted fabrics, braids, stitch-bonded fabrics, nonwoven fabrics, and felts; and three-dimensional fibrous structures, i.e., body structures, e.g., textile hoses, stockings, or textile semi-finished products; and further, finished products made from the aforementioned products that are assembled, opened up, and / or otherwise made marketable for processing, trading, or end consumers. As used herein, the term “textile waste” encompasses the textile materials as defined above, whose inherent value has been consumed from the perspective of the current owner, and thus the material is at the end of its lifespan for the owner.

[0121] As used herein, the term “engineering plastics” refers to high-performance plastic grades that possess physical properties enabling them to be used in structural applications, over a wide temperature range, under mechanical stress, and for extended periods in challenging chemical and physical environments, for example, to manufacture plastic components as an alternative to conventional engineering materials such as metals and ceramics. Engineering plastics are particularly applicable to the manufacture of mechanical components across several industries, such as automotive, medical, electrical and electronic, aerospace, construction, and consumer products. As used herein, the term “engineering plastic waste” encompasses the engineering plastic materials defined above, whose inherent value has been consumed from the perspective of the current owner, and thus the material is at the end of its lifespan for said owner.

[0122] As used herein, the term “Elastane” is also referred to as “Spandex,” and common trade names for spandex include Lycra, Elaspan, Acepora, Creora, Inviya, Roica, Dorlastan, Linel, or ESPA.

[0123] In the context of the present invention, the phrase "X is one or more of A, B, and C" should be understood as disclosing that X is either A, B, or C, or A and B, or A and C, or B and C, or A, B, and C. In this regard, those skilled in the art can translate the above abstract terms into concrete examples, for example, X is a chemical element and A, B, and C are specific elements, e.g., Li, Na, and K, or X is a temperature and A, B, and C are specific temperatures, e.g., 10°C, 20°C, and 30°C. In this regard, it should be noted that it is possible to extend the above terms to less specific realizations of the features, for example, "X is one or more of A and B" to disclose that X is either A, or B, or A and B, or for more specific realizations of the features, for example, "X is one or more of A, B, C, and D" to disclose that X is either A, or B, or C, or D, or A and B, or A and C, or A and D, or B and C, or B and D, or C and D, or A and B and C, or A and B and D, or B and C and D.

[0124] Preferred embodiments of the present invention are further shown in Figures 1 to 14, as described below. [Brief explanation of the drawing]

[0125] [Figure 1]Figure 1 shows the process according to the present invention. A properly supplied solid material M containing polyamide 6 is fed into a melting unit UM, from which a liquid stream SM is obtained, which is then passed through a pre-reaction unit UPR, where it is mixed with a liquid aqueous stream SW. The liquid stream SF obtained from unit UPR is then passed through a reaction unit UR, where it is subjected to depolymerization conditions for polyamide 6 to obtain an aqueous depolymerization mixture containing ε-caprolactam dissolved in water. From unit UR, an aqueous liquid reactor outlet stream SR containing ε-caprolactam dissolved in water is removed. [Figure 2] Figure 2 shows a process according to the present invention. In addition to the process design shown in Figure 1, the melting unit UM according to Figure 2 is equipped with a degassing system. Through this degassing system, the gas stream SGM obtained when the solid material M is melted in UM is removed. The stream SGM is then passed through the scrubbing unit US. [Figure 3] Figure 3 shows the process according to the present invention. In addition to the process design shown in Figure 2, a filtration unit UF is positioned downstream of the melting unit UM and upstream of the reaction unit UR. The stream SM obtained from unit UM passes through this filtration unit and, downstream of UF, is passed to the pre-reaction unit UPR as a properly filtered stream SM. [Figure 4]This figure shows the process according to the present invention. A preferred design of the reaction unit UR is shown in comparison to the process design shown in Figure 3. According to this preferred design, unit UR consists of three reactors R1, R2, and R3 arranged in series, preferably vertically. Stream SSF obtained from the preliminary reaction unit UPR is supplied to reactor R1, where it is subjected to depolymerization conditions for polyamide 6, from which a liquid aqueous stream S1 is obtained, which contains ε-caprolactam dissolved in water and further contains undepolymerized polyamide 6. Stream S1 is then passed to reactor R2, preferably by gravity alone, where it is subjected to depolymerization conditions for polyamide 6, from which a liquid aqueous stream S2 is obtained, which contains ε-caprolactam dissolved in water and further contains undepolymerized polyamide 6. Stream S2 is then passed to reactor R3, preferably by gravity alone, where it is subjected to depolymerization conditions for polyamide 6, from which a liquid aqueous stream S3 containing ε-caprolactam dissolved in water is obtained. Next, this stream S3 is removed from the reaction unit UR as stream SR. [Figure 5]Figure 5 shows a preferred design for reactor Ri used according to the present invention. For example, as described above in relation to Figure 4, if two or more reactor Ri are used, it is preferable that all reactor Ri exhibit this preferred design. Figure 5 shows reactor Ri which is a stirred tank reactor. In Figure 5, the following reference numbers are used: (1) Vertically arranged three-compartment reactor Ri (2) Outlet means for degassing the reactor (3) Outlet means for removing liquid reaction mixture from Ri (4) Inlet means for supplying a liquid stream to Ri, for example, stream SF to R1 (5) Heating jacket (6.1) Upper compartment (6.2) Middle compartment (6.3) Bottom compartment (7.1) Stirrer in the upper compartment (7.2) Stirrer in the middle compartment (7.3) Stirrer in the middle compartment (8) Drive unit for the stirrers described in (7.1) to (7.3) (9.1) Partition between the upper and middle compartments with a flow opening (9.2) Partition between the middle and bottom compartments with a flow opening (10.1) Inlet means for passing the heating medium through the heating jacket (5) (10.2) Outlet means for removing the heating medium from the heating jacket (5) [Figure 6] Figure 6 shows a process according to the present invention. Compared to the process design shown in Figure 4, the preferred design shows how the solid material M is supplied. According to Figure 6, the solid material is supplied into a delivery unit MMD, which may include, for example, one or more big bag stations and / or one or more bulk container stations. From the unit UMD, the material is then appropriately passed through a material collection unit MMC, which preferably includes, more preferably consists only of, a drum. From the unit MMC, the material is then appropriately passed through a melting unit UM. [Figure 7]Figure 7 shows a process according to the present invention. Compared with the process design shown in Figure 6, the preferred process shows how the solid material is passed from the delivery unit UMD to the collection unit UMC via a first connection line. The unit UMD according to Figure 7 comprises, for example, one bulk container station and two big bag stations through which the material M is passed to a particle separation unit UFMPS(1). From the first big bag station, the material M is passed to the particle separation unit UFMPS(2.1), and from the second big bag station, the material M is passed to the particle separation unit UFMPS(2.2). From UFMPS(1), the material M then passes through a supply unit UFMF(1), for example, a rotary feeder, and through UFMF(1), it is passed to receiving and discharging means UMRD(3), preferably a hopper, and UMRD(4), preferably a hopper, and may be distributed by option. Furthermore, the material M may be passed from UFMPS(2.1) to receiving and discharging means UMRD(2.1), preferably a hopper, through a supply unit UFMF(2.1), for example, a rotary feeder, and via UFMF(2.1), from UMRD(2.1) to receiving and discharging means UMRD(3) and UMRD(4), and optionally distributed. Similarly, the material M may be passed from UFMPS(2.2) to receiving and discharging means UMRD(2.2), preferably a hopper, through a supply unit UFMF(2.2), for example, a rotary feeder, and via UFMF(2.2), from UMRD(2.2) to receiving and discharging means UMRD(3) and UMRD(4), and optionally distributed. Next, from either UMRD(3) and / or UMRD(4), the material M is passed through the collection unit UMC via either unit UFMF(3), preferably a rotary feeder, and / or unit UFMF(4), preferably a rotary feeder. Furthermore, Figure 7 shows gas streams SG(1), SG(2), and SG(3), which are passed through their respective sections of the first connection line to transport the material M (pneumatically) to their respective downstream units as shown.At least one, preferably all, of the gas streams is preferably subjected to gas filtration, followed by compression and subsequent cooling before being passed through each section of the first connection line (not shown). [Figure 8] Figure 8 shows a process according to the present invention. Compared to the process design shown in Figure 6, the preferred process shows how the solid material is passed from a collection unit UMC, which preferably has a collection drum, to a melting unit UM via a second connection line. According to Figure 8, the solid material M is passed from the unit UMC to a first feed unit USMF(1), e.g., a rotary feeder, to a particle separation unit USMPS, e.g., a vibrating screen. Then, from the USMPS, the material M is passed to a second feed unit USMF(2), preferably a weight loss feed means, e.g., a weight loss screw, from which the material M is appropriately passed to the melting unit UM. Preferably, a preferred process upstream of the unit UM, as shown in Figure 8, should be seen in relation to a preferred process, as shown in Figure 6. [Figure 9] Figure 9 shows a process according to the present invention. Compared to the process design shown in Figure 4, it is further shown that gas streams SGi are obtained in each reactor Ri contained in unit UR and removed therefrom. These gas streams, specifically SG1, SG2, and SG3, are then appropriately combined and passed through scrubber unit US. Note that streams SGi may be passed through unit US separately (alternative examples are not shown). One or more of the streams SGi may be combined with gas stream SGM obtained from molten unit UM before being supplied to US (alternative examples are not shown). [Figure 10]Figure 10 shows a process according to the present invention. Figure 10 shows a preferred sequence of steps downstream of the reaction unit UR and preferred recycling (reuse) of water via stream SW. According to the process in Figure 10, a liquid aqueous stream S3 is obtained from the final reactor R3 of unit UR containing ε-caprolactam and one or more impurities, and is removed therefrom as stream SR. This stream SR is then passed through the evaporation unit UE, from which a liquid aqueous stream SL and one or more aqueous vapor streams SV are obtained and removed, although in Figure 10 only one vapor stream SV is shown. Stream SL has a higher ε-caprolactam concentration than stream SR. Stream SL is then passed through a heat-consuming purification unit UP where further purification of ε-caprolactam takes place. From stream SL supplied to UP, a product stream SCPL containing ε-caprolactam at a significantly higher concentration than that of stream SL is finally obtained. According to the process of the present invention, at least a portion of the heat consumed in the purification unit UP is at least partially supplied by at least one of one or more steam streams SV, and based on SV, one or more at least partially condensed aqueous streams SVW are obtained and removed from UP, although only one stream SVW is shown in Figure 10. Furthermore, one or more aqueous streams SRW are obtained from SL from the purification unit UP. Then, at least one stream SVW is at least partially recycled (reused) to the reaction unit UR, and at least one stream SRW is at least partially recycled to the reaction unit UR, and for the purpose of the aforementioned recycling, streams SVW and SRW are passed through the water treatment unit UW, from which a stream SW is obtained which is then (at least partially) recycled to the reaction unit UR as an aqueous stream SW (or a portion thereof). Furthermore, one or more wastewater streams SWW are obtained from UW which are not recycled into the process. Preferably, the water treatment unit UW may comprise a water recovery unit UWR and optionally a wastewater unit UWW.Preferably, the streams SVW and SRW are passed through a water treatment unit UW, where they are appropriately purified and / or collected to obtain one or more aqueous recycling streams. The streams obtained from such purification may then be passed through a wastewater treatment unit UWW, where a wastewater stream SWW is obtained. [Figure 11]Figure 11 shows a process according to the present invention. The process according to Figure 11 shows the further use of stream SCPL, i.e., purified ε-caprolactam. According to the present invention, stream SCPL is preferably passed through a polyamide 6 production unit UPP, where it is used as a starting material. If necessary, one or more further streams SNCPL can be passed through the UPP, the streams containing non-recycled ε-caprolactam, i.e., ε-caprolactam from a conventional source. The respective prepared polyamide 6 materials are then passed through a unit UTP, where they are used as starting materials for preparing polyamide 6-containing materials, preferably polyamide 6-containing fiber materials. If necessary, one or more further streams SNPA6 can be passed through the UTP, the streams containing non-recycled polyamide 6, i.e., polyamide 6 from a conventional source. Depending on the type of material to be prepared in the UTP, further streams containing one or more starting materials other than polyamide 6 can also be passed through the UTP. Next, the fibrous material MT obtained from the material, preferably UTP, is brought to market and remains there for a given service life TMT. Thereafter, each end-of-life material is appropriately collected in a collection unit UTC, preferably a fibrous material collection unit, and from there is appropriately passed to the reaction unit UR, preferably as a stream SM or as part of a stream SM, via a unit UM for supplying the stream SM to the UR. Such a unit UM usually comprises any apparatus capable of appropriately passing the solid material M to the reaction unit UR. Preferably, the UM comprises apparatus, for example, one or more silos, one or more hoppers, one or more truck unloading stations, one or more big bag unloading stations, etc. Furthermore, Figure 11 shows that in the manufacturing unit UTP, the remaining material MR is obtained from the manufacturing process, i.e., material not included in MT. As an example, MR may be in the form of fiber cuttings.This material can be supplied to the UR either as a stream SM or as part of a stream SM via UTC and / or directly via UM, preferably according to the processes shown in Figures 6, 7, and 8 above. [Figure 12] Figure 12 is a diagram illustrating the process according to the present invention. Compared with Figure 11, a preferred design of unit UP is shown, i.e., the process shown in Figure 12 represents a preferred method for purifying stream SL with respect to ε-caprolactam. According to this process, stream SL is first passed through a water separation unit UWS, from which one or more streams SRW are obtained, which are then preferably passed through a water treatment unit UW, as already shown in Figure 11. Furthermore, at least one of the streams SV is passed through the UWS to at least partially satisfy the heat demand of the UWS, and from this at least one stream SV passed through the UWS, one or more at least partially condensed streams SVW1 are obtained, which are preferably further passed through a water treatment unit UW, specifically UWR. The streams SUWS containing ε-caprolactam are then passed through a distillation unit UD, which are preferably further purified with respect to ε-caprolactam. Furthermore, at least one of the streams SV is passed through the UD to at least partially meet the heat requirements of the UD, and based on this at least one stream SV passed through the UD, one or more at least partially condensed streams SVW2 are obtained, which are preferably further passed through the water treatment unit UW, specifically UWR. The stream SUD containing ε-caprolactam is then preferably passed through the crystallization unit UC for further purification of ε-caprolactam. Furthermore, at least one of the streams SV is passed through the UC to at least partially meet the heat requirements of the UC, and based on this at least one stream SV passed through the UC, one or more at least partially condensed streams SVW3 are obtained, which are preferably further passed through the water treatment unit UW, specifically UWR. [Figure 13]Figure 13 is a diagram illustrating the process according to the present invention. A preferred design of unit UWS is shown in comparison to Figure 13, i.e., the process shown in Figure 13 illustrates a preferred method for separating water from stream SL. According to this process, stream SL is first passed through a first stage of water separation carried out in unit UWS1. From UWS1, stream SUWS1 containing ε-caprolactam is then passed through an intermediate processing stage UI, where impurities may be removed. The thus purified stream SUI obtained from UI is then passed further through a second stage of water separation carried out in unit UWS2. From unit UWS2, stream SUWS2 containing ε-caprolactam is obtained, which corresponds to stream SUWS shown in Figure 12, and is then preferably passed through distillation unit UD. From intermediate unit UI, streams SI containing the separated impurities are removed and may be further utilized depending on the amount and / or chemical nature of the impurities. According to this process, one or more aqueous streams SRW1 are obtained, which are then preferably passed through water treatment units UW, specifically UWR. Furthermore, this process yields one or more aqueous streams SRW2, which are then preferably passed through a water treatment unit UW, specifically a UWR. Preferably, at least one of the streams SV is passed through UWS1 to at least partially meet the heat requirements of UWS1, and based on this at least one stream SV passed through UWS1, one or more at least partially condensed streams SVW11 are obtained, which are preferably further passed through a water treatment UW, specifically a UWR. Preferably, at least one of the streams SV is passed through UWS2 to at least partially meet the heat requirements of UWS2, and based on this at least one stream SV passed through UWS2, one or more at least partially condensed streams SVW12 are obtained, which are preferably further passed through a water treatment UW, specifically a UWR. [Figure 14]Figure 14 shows the process according to the present invention. Compared with Figure 13, it further shows a preferred recycling loop as already shown in Figure 11 above, as well as the processing of the gas stream SGi obtained in and removed from reactors R1, R2, and R3, as already shown in Figure 9 above.

Claims

1. A process for depolymerizing polyamide 6 contained in solid material M by hydrolysis, wherein this process is (i) A step of supplying a solid material M, (ii) The solid material M supplied according to (i) is melted in the melting unit U Ｍ It melts at pressure p ＳＭ At temperature T ＳＭ Liquid stream S Ｍ Steps to obtain, (iii) pressure p ＳＷ At temperature T ＳＷ Liquid aqueous stream S Ｗ The steps of supplying, (iv) the stream S obtained according to (ii) Ｍ is supplied to the stream S supplied according to (iii) Ｗ and pre-reaction unit U ＰＲ and mixed therein to obtain a liquid reaction feed stream S having a pressure p ＳＦ at a temperature T ＳＦ and a step of obtaining Ｆ ​ The stream S obtained according to (v)(iv) Ｆ chemical reaction unit U Ｒ Steps to supply to the inside, (vi) The aforementioned chemical reaction unit U Ｒ The stream S within Ｆ The depolymerization pressure p of polyamide Ｄ The depolymerization temperature T of polyamide 6 Ｄ A polyamide 6 containing ε-caprolactam is subjected to depolymerization conditions, and an aqueous depolymerized mixture containing ε-caprolactam dissolved in water is subjected to U Ｒ Steps to be taken inside, (vii) U Ｒ From the aqueous liquid reactor outlet stream S Ｒ A step of extracting the stream S Ｒ However, the step involves a step containing ε-caprolactam dissolved in water, This includes, where 0.8 ≤ T ＳＦ / T Ｄ ≤ 1.05, and 0.9 ≤ p ＳＦ / p Ｄ A process where the value is ≤ 1.

05.

2. 0.6 ≤ T ＳＭ / T ＳＦ ≤ 1.05, and 0.9 ≤ p ＳＭ / p ＳＦ ≤ 1.05 and 0.8 ≤ T ＳＷ / T ＳＦ ≤ 1.3 and ≤ 0.9 p ＳＷ / p ＳＦ The process according to claim 1, wherein ≤ 1.

05.

3. (iv) The preliminary reaction unit U ＰＲ However, it includes, preferably a static mixing unit, preferably consisting only of that, according to (iv), S Ｗ and S Ｍ However, a specific mixing ratio (m Ｗ (kg) / (m) Ｐ (m) / kg, preferably in the range of 1:1 to 20:1, more preferably in the range of 2:1 to 15:1, and more preferably in the range of 5:1 to 10:

1. Ｗ (kg) / (m) Ｐ U ( / kg) ＰＲ Mixed inside, here, m Ｗ is S Ｗ This is the amount of water contained in, and m Ｐ is S Ｍ This is the amount of polyamide 6 contained in the product. The melting unit U Ｍ However, it includes an extruder, preferably a single-screw extruder or a twin-screw extruder, and preferably consists only of an extruder, where the melting unit U Ｍ However, preferably equipped with a degassing system, the process is preferably carried out in the melt according to (ii) U Ｍ From Gasstream S ＧＭ The step includes taking out the gas stream S ＧＭ However, pressure p ＧＭ At temperature T ＧＭ It has, where preferably 0.95 ≤ T ＧＭ / T ＳＭ ≤ 1.05, U Ｍ The gas stream S extracted from ＧＭ However, preferably a scrubbing unit U Ｓ The process according to claim 1 or 2, wherein the process is subjected to scrubbing.

4. The melting unit U Ｍ Downstream of and the reaction unit U Ｒ Upstream of that, filtration unit U Ｆ Particles having a particle size preferably in the range of 100 to 500 micrometers, preferably in the range of 200 to 400 micrometers, are fed into the liquid stream S. Ｍ Filtration unit U for separation Ｆ The following is arranged, and here the process is performed before mixing according to (iv), the stream liquid stream S Ｍ to U Ｆ The process according to any one of claims 1 to 3, comprising the step of passing to

5. According to (vi), T Ｄ The temperature is in the range of 230 to 330°C, and p Ｄ The bar is in the range of 40 to 140 bar, preferably T Ｄ The temperature is in the range of 250 to 320°C, and p Ｄ The bar is in the range of 40 to 125 bar, and more preferably T Ｄ The temperature is in the range of 270 to 310°C, and p Ｄ The process according to any one of claims 1 to 4, wherein the bar is in the range of 40 to 110 bar.

6. (v) The reaction unit U Ｒ However, z chemical reactors R ｉ The reactor is equipped with i = 1...z, where z is in the range of 1 to 10, preferably 1 to 8, more preferably 1 to 6, more preferably 1 to 5, more preferably 1 to 4, more preferably 1 to 3, and z > 1, then at least two reactors R ｉ Preferably z reactors R ｉ They are connected in series, - According to (v), the stream S ＳＦ However, R ｉ It is supplied into, i=1, - Aqueous liquid Stream S containing ε-caprolactam dissolved in water ｉ However, reactor R ｉ Removed from reactor R ｉ＋１ It is supplied to, i < z, - According to (vii), an aqueous liquid Stream S containing ε-caprolactam dissolved in water. ｚ However, Stream S Ｒ The reactor R ｚ Taken out from, Here, in all reactors R ｉ the depolymerization pressure p Ｄｉ and the depolymerization temperature T Ｄｉ are maintained, and independently of each other, T Ｄｉ is in the range of 230 to 330 °C, and p Ｄｉ is in the range of 40 to 140 bar, preferably T Ｄｉ is in the range of 250 to 320 °C, and p Ｄｉ is in the range of 40 to 125 bar, more preferably T Ｄｉ is in the range of 270 to 310 °C, and p Ｄｉ is in the range of 40 to 110 bar. When z > 1, the z reactors R ｉ are preferably arranged vertically, R １ is the uppermost reactor, R ｚ is the lowermost reactor, and S ｉ obtained from R ｉ preferably moves to R ｉ＋１ by gravity, more preferably by only gravity. The process according to any one of claims 1 to 5

7. At least one, preferably z, reactors R ｉ However, it is a stirred tank reactor, preferably all stirred tank reactors R ｉ However, it has two to six compartments, more preferably two to five compartments, more preferably two to four compartments, which are independent of each other, and the compartments are preferably arranged in series, more preferably in series and vertically, and two adjacent compartments are separated by a partition including at least one flow opening, preferably in a reactor R ｉ At least one section within is equipped with at least one stirrer, and more preferably all reactors R ｉ Each section is equipped with at least one stirrer, and more preferably all reactors R ｉ Each compartment is equipped with one stirrer, and the process includes the step of stirring the depolymerized mixture in a given compartment for at least a portion of the time while it is subjected to depolymerization conditions in the compartment. Here, the depolymerization conditions for the polyamide 6 according to (vi) are preferably unit U Ｒ , more preferably z reactors R ｉ , more preferably, the total residence time t of the aqueous depolymerization mixture in z stirred tank reactors Ｄ The mixture further comprises at least 85% by weight, preferably at least 90% by weight, and more preferably at least 95% by weight of the aqueous depolymerization mixture, with a t concentration ranging from 30 to 90 minutes. Ｄ It has, If z > 1, reactor R ｉ The residence time of the aqueous depolymerization mixture inside is t Ｄｉ And preferably 0.90 ≤ (t Ｄｉ / t Ｄｉ＋１ ) ≤ 1.10, more preferably 0.95 ≤ (t Ｄｉ / t Ｄｉ＋１ The process according to claim 6, wherein ) ≤ 1.

05.

8. at least one reactor R ｉ Therefore, preferably all z reactors R ｉ From each gas stream S Ｇｉ pressure p Ｇｉ At temperature T Ｇｉ A given gas stream S having Ｇｉ The step includes extracting, and 0.95 ≤ T Ｇｉ / T Ｄｉ ≤ 1.05, and the process preferably, as defined in claim 3, the gas stream S ＧＭ Before subjecting it to scrubbing, the gas stream S Ｇｉ At least one of the streams S, preferably all of them Ｇｉ The gas stream S as defined in claim 3 ＧＭ The process according to claim 6 or 7, further comprising the step of combining with

9. (i) The supply of the solid material M in accordance with (i) (i.1) Delivery Unit U ＭＤ A step of supplying the solid material M inside U ＭＤ Preferably, the system includes one or more of at least one big bag station and at least one bulk container station. (i.2) The solid material M supplied in accordance with (i.1) is supplied to the unit U via the first connection line. ＭＤ From material collection unit U ＭＣ Preferably, the step of passing the material to a collection drum, where the first connection line preferably connects to at least one material receiving and discharge unit U ＭＲＤ , at least one first material supply unit U ＦＭＦ , and at least one first particle separation unit U ＦＭＰＳ A step comprising one or more of the following, (i.3) The solid material M is placed in the unit U ＭＣ From the second connection line to the unit U Ｍ The step of passing through, wherein the second connection line preferably passes through at least one second material supply unit U ＳＭＦ , at least one second particle separation unit U ＳＭＰＳ The steps include, and comprising one or more of at least one metal detector, Here, the first connection line by (i.2) preferably connects to at least one unit U ＭＲＤ Preferably comprising at least one hopper, more preferably at least one one-zone hopper, and preferably at least one unit U ＦＭＦ Preferably further comprising at least one rotary feeder, and preferably at least one particle separation unit U ＦＭＰＳ , more preferably comprising at least one filter, more preferably at least one mesh filter, The solid material M is connected to the unit U via the first connection line. ＭＤ From the unit U ＭＣ To pass through, at least one gas stream S Ｇ However, preferably the gas stream is passed through a first connection line, and the at least one gas stream preferably contains air or dilute air, more preferably consisting of only air, where, prior to passing through the first connection line, the at least one gas stream is pretreated preferably by at least one of filtration, compression, and cooling, more preferably by filtration, compression, and cooling. (i.3) The second connection line is connected to at least two units U ＳＭＦ Preferably, at least two units U comprising a rotary feeder and a weight loss feeder. ＳＭＦ Preferably comprising, more preferably, the rotary feeder is located upstream of the weight loss feeder and unit U ＳＭＰＳ The process according to any one of claims 1 to 8, preferably further comprising a vibrating screen.

10. (i) The solid material M is supplied in the form of granules, preferably U Ｍ The granules are supplied to a system where the particle size distribution of the granules is preferably characterized by one or more pairs of the following values, preferably two or more pairs of the following values, and more preferably three pairs of the following values. - D10 values ​​for particle widths in the range of 0.3 to 15 mm, and D10 values ​​for particle lengths in the range of 0.3 to 15 mm. - D50 values ​​for particle widths in the range of 0.5 to 20 mm, and D50 values ​​for particle lengths in the range of 0.5 to 20 mm. - D90 values ​​for particle widths in the range of 0.8 to 30 mm, and D90 values ​​for particle lengths in the range of 0.8 to 30 mm. The process according to any one of claims 1 to 9, wherein preferably 10 to 100% by weight, more preferably 30 to 100% by weight, more preferably 50 to 100% by weight, more preferably 60 to 100% by weight, more preferably 70 to 100% by weight, and more preferably 80 to 100% by weight of the solid material M consists solely of polyamide 6.

11. The liquid aqueous stream S supplied according to (iii) Ｗ The process according to any one of claims 1 to 10, wherein 90 to 100% by weight, preferably 91 to 100% by weight, more preferably 92 to 100% by weight, more preferably 93 to 100% by weight, more preferably 94 to 100% by weight, and more preferably 95 to 100% by weight consists solely of water.

12. The process according to any one of claims 1 to 11, wherein the solid material M supplied in accordance with (i) comprises, preferably, one or more of waste, preferably textile waste and engineering plastic waste, more preferably textile waste, and preferably solely thereof.

13. (vii) According to the stream S Ｒ However, concentration c ＳＲ The stream S contains ε-caprolactam dissolved in water. Ｒ However, if the process further contains one or more impurities, the process is as follows: (viiii) The liquid aqueous stream S Ｒ Evaporation unit U Ｅ Pass through to S Ｒ From, c ＳＬ > c ＳＲ The concentration c ＳＬ Aqueous Stream S containing ε-caprolactam dissolved in water Ｌ Having obtained S Ｒ From one or more water vapor streams S Ｖ Steps to obtain, (ix) The aqueous stream S Ｌ Heat consumption purification unit U Ｐ Pass through to S Ｌ From, c ＳＣＰＬ >>c ＳＬ The concentration c ＳＣＰＬ Stream S containing ε-caprolactam ＣＰＬ Having obtained S Ｌ From one or more Aqueous Stream S ＲＷ A step to obtain U Ｐ At least a portion of the heat consumed is used in the one or more streams S Ｖ At least one of the streams S is supplied by at least one of the streams S Ｖ From, at least one at least partially condensed aqueous stream S ＶＷ To obtain, steps, (x) at least partially at least one stream S ＶＷ to the reaction unit U Ｒ It is recycled to and at least partially to at least one stream S ＲＷ to the reaction unit U Ｒ The steps to recycle The process according to any one of claims 1 to 12, further comprising:

14. The stream S obtained according to (ix) ＣＰＬ Polyamide 6 Manufacturing Unit U ＰＰ The process further includes the step of supplying to U ＰＰ The polyamide 6 produced in the fiber material manufacturing unit U ＴＰ It is supplied as raw material to its unit U ＴＰ from, (A) Textile materials M brought into the market Ｔ The fiber material M is obtained. Ｔ Useful life T ＭＴ Afterwards, at least partially as textile waste, textile material collection unit U ＴＣ Collected, (B) Remaining ingredients M Ｒ This is obtained as textile waste. Here, at least a portion of the textile waste from (A), or at least a portion of the textile waste from (B), or at least a portion of the textile waste from (A) and at least a portion of the textile waste from (B) are U Ｍ via U Ｒ The process according to claim 13, which is appropriately supplied to.

15. S can be obtained by the process according to claim 16 for producing one or more polymers and polymer products. ＣＰＬ The use of the polymer, or the polymer product, or the polymer and the polymer product, is in the form of at least one of granules, strands, rods, plates, pipes, foils, layers, films, sheets, fibers, filaments, coatings, extruded articles, molded articles, flexible foams, semi-rigid foams, and rigid foams; and the polymer, or the polymer product, or the polymer and the polymer product, comprises polyamide 6 and optionally, possibly, at least one further polymer compound, wherein the at least one further polymer compound preferably comprises at least one polyamide 6.6; at least one semi-polyamide 6T and polyamide 6I. Aromatic polyamide; at least one polyethylene terephthalate; at least one polyurethane; at least one polyester; at least one polyether; at least one polyvinyl chloride; at least one natural fiber material, e.g., wool and cotton; at least one cellulose material; at least one natural elastomer; at least one synthetic elastomer; at least one copolymer of two or more of the aforementioned polymer compounds, including statistical copolymers, gradient copolymers, alternating copolymers, block copolymers, and graft copolymers; and at least one rubber material comprising at least one natural rubber material and at least one synthetic rubber material, The polymer, or the polymer product, or the polymer and the polymer product are preferably one or part of one of the following: - Parts of an automobile, preferably cylinder head covers, engine covers, intake radiator housings, intake radiator flaps, intake pipes, intake manifolds, connectors, gear wheels, fan wheels, coolant boxes, heat exchanger housings or housing components, coolant coolers, intake radiators, thermostats, water pumps, radiators, fastening components or parts of battery systems for electric transport, dashboards, steering column switches, seats, headrests, center consoles, transmission components, door modules, automotive exteriors for A, B, C or D pillar covers, spoilers, door handles, exterior mirrors, windshield wipers, windshield wiper protective housings, decorative grilles, cover strips, roof rails, window frames, sunroof frames, antenna panels, headlights, taillights, airbags, and / or cushions; - Cloth, clothing, preferably shirts, trousers, pullovers, boots, shoes, soles, tights and / or jackets; - Electrical components, preferably electrical components, passive electronic components, active electronic components, printed circuit boards, housing components, wheels, lines, switches, e.g., microswitches, plugs, sockets, distributors, relays, resistors, capacitors, inductors, bobbins, lamps, diodes, e.g., LEDs, transistors, connectors, regulators, integrated circuits (ICs), processors, controllers, memory, sensors, microbuttons, semiconductors, e.g., reflector housings for light-emitting diodes, fasteners, spacers, bolts, strips, slide-in guides, screws, nuts, film hinges, snap hooks (snap-ins), and / or spring tongues for electrical and / or electronic components; - Consumer and / or pharmaceutical products, preferably tennis strings, climbing ropes, bristols, brushes, artificial grass, 3D printing filaments, lawnmowers, zippers, hook-and-loop fasteners, paper machine garments, extruded coatings, fishing lines, fishing nets, seabed lines and ropes, vials, syringes, ampoules, bottles, sliding elements, spindle nuts, chain conveyors, plain bearings, rollers, wheels, gears, rollers, ring gears, screws and spring dampers, hoses, pipelines, cable sheaths, sockets, switches, cable ties, fan wheels, carpets, cosmetic boxes and / or bottles, mattresses, cushions, insulation materials; - Packaging for the food industry, preferably single-layer and / or multi-layer inflated films, cast films (single-layer and / or multi-layer), biaxially oriented films, and laminate films.

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